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LANDFORMS AND LANDFORMS AND OCEANSOCEANS
Science Standard 5-3Science Standard 5-3The student will demonstrate an The student will demonstrate an
understanding of features, understanding of features, processes, and changes in Earth's processes, and changes in Earth's
land and oceans. land and oceans.
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5-3.1 Explain how natural 5-3.1 Explain how natural
processes (including weathering, processes (including weathering,
erosion, deposition, landslides, erosion, deposition, landslides,
volcanic eruptions, earthquakes, volcanic eruptions, earthquakes,
and floods) affect Earth's oceans and floods) affect Earth's oceans
and land in constructive and and land in constructive and
destructive ways.destructive ways.
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What are constructive
forces?
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Constructive forces are processes that create or build up
landforms.
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What are destructive
forces?
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Destructive forces are processes that
destroy or wear down landforms.
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What are some
examples of
landforms?
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pinker.wjh.harvard.edu/.../Grand%20Canyon.htm
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gsbwww.uchicago.edu/.../porcupines.html
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media.vacationeasttennessee.org/pfoutdoorattr...
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What are natural processes?
How do they affect land and oceans?
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WeatheringWeathering
This is a destructive force and
can be chemical or physical. It
causes the surface of the earth
to dissolve, decompose, and
break into smaller pieces.
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Water is an important cause of weathering.
Plants cause weathering when roots break apart.
Changes in temperature can break rock, as well as ice forming inside of cracks in the rock causing it to break even more.
Anything that causes rocks to wear down is a cause of weathering.
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ErosionErosion
This is a destructive force. It is
the movement of sediments
and soil by wind, water, and
gravity.
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Erosion SongErosion Song
• Tune: "Jingle Bells" Running down a hill Wind blowing in a gale,
Or coming down as snow, Or gentle as a breeze,
Water causes much Wears the rock away
Erosion, this we know. And carries sand with ease.
Wave action moves the beach. A hurricane last year,A river carves the land. And glaciers long ago,Everywhere that water goes, Are ways that natural forces use It carries dirt or sand. To change the Earth we know.
Chorus: (repeat chorus)
Oh, wind and rain, snow and ice,
Water running free;
These all cause land to erode
With changes we can see.
Wind and rain, snow and ice,
Water running free;
These all cause land to erode
With changes we can see.
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LandslideLandslide
This is a destructive force. This
is a mass movement of land
due to gravity.
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Landslides even occur on the continental slope in the ocean!
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LandslideLandslide
Landslides
can cause
buildings to
fall, or power
and gas lines
to break.
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DepositionDeposition
This is a constructive force. It
builds up new land by dropping
or depositing sediments via
water, wind, or ice.
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Deposition created the Mississippi River Delta near the New Orleans area.
Deposition causes the sand to pile up and create sand dunes on our beaches.
Shells on our beaches are deposition by ocean waves.
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Weathering & ErosionWeathering & Erosion
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Volcanic EruptionVolcanic Eruption
This is a constructive force. During
an eruption, melted rock rises
from deep within the earth and
reaches the surface. They can
also occur under the oceans.
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Volcanoes can change Earth’s surfaces.
When the magma erupts from the volcano the top of the mountain can be changed, either built up or blown off.
The lava and ash can destroy forests and bury fields.
Volcanic eruptions can even change Earth’s weather patterns.
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Volcanic EruptionVolcanic EruptionSeamounts are
volcanoes that are
built up under the
ocean. If the
seamount rises
above the ocean
surface it is called
a volcanic island
(like Hawaii and
Japan!)
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Volcanic EruptionsVolcanic Eruptions
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EarthquakeEarthquake
This is a destructive force.
Earthquakes are vibrations on
Earth’s surface caused by
sudden movement in the Earth,
often along a fault, a break in
Earth’s surface.
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Some earthquakes cause little damage and some cause a lot of damage.
Large earthquakes can cause landslides.
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EarthquakeEarthquake
Earthquakes under the ocean
can cause huge waves
(tsunamis) that can destroy
land and cause great damage if
they come ashore.
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Volcanoes And EarthquakesVolcanoes And Earthquakes
This map shows how volcanoes and earthquakes occur along tectonic plate boundaries.http://www.pbs.org/wgbh/nova/teachers/activities/2515_vesuvius.html
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FloodFlood
This is a destructive force. Floods
occur when a large amount of
water covers land that is normally
dry.
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When the flood occurs, rapid erosion can take place and move soil and sediments away.
When the flood recedes, new sediment is left behind and can build up rich soil deposits.
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5-3.2 Illustrate the geologic 5-3.2 Illustrate the geologic
landforms of the ocean floor: landforms of the ocean floor:
*continental shelf *continental shelf
*continental slope *continental slope
*mid-ocean ridge *mid-ocean ridge
*rift zone *rift zone
*trench *trench
*ocean basin *ocean basin
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The edges of the continents slope down from the shore into the ocean.
The part of the continent located under the water is known as the continental shelf.
The width of the continental shelf varies around the edges of the continents.
In some places the continental shelf is fairly shallow and in some places it becomes very deep, but it is not the deepest part of the ocean.
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The steep slope where the continental shelf drops to the bottom of the ocean floor is called the continental slope.
The depth of the ocean water increases greatly here.
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Continental shelf, slope, rise
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On the bottom of the ocean, there is a central ridge, or mountain range, that divides the ocean floor into two parts.
These underwater volcanic mountains are known as the mid-ocean ridge.
Volcanic mountains not formed on the mid-ocean ridge are called seamounts.
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In the center of the highest part of the mid-ocean ridge is a narrow trench called a rift.
Underwater volcanic activity that adds mountains to either side of the mid-ocean ridge occurs at the rift zone.
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There are many steep-sided canyons and deep, narrow valleys in the bottom of the ocean.
Ocean trenches are the deepest part of the ocean basin and are deeper than any valley found on dry land.
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Located on either side of the mid-ocean ridge is the ocean basin.
It is made up of low hills and flat plains.
The flat area of the ocean basin is called the abyssal plain.
Seamounts are generally formed on the ocean basin.
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Seamounts
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Abyssal Plains
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http://www.mos.org/oceans/planet/features.html
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5-3.3 Compare continental and 5-3.3 Compare continental and
oceanic landforms. oceanic landforms.
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Earth is made of solid land. Earth is made of solid land.
Some of the land is located Some of the land is located
above Earth’s water and some above Earth’s water and some
is located below the oceans.is located below the oceans.
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Explain how landforms above Explain how landforms above
the oceansthe oceans are similar to are similar to
those found below the oceans.those found below the oceans.
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Continental Landform
Oceanic Landform
Canyon Trench
Valley Rift
Volcano Seamount
Mountain range Mid-ocean ridge
Low hills or plainsOcean basin and
plains
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Valleys
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Mountains
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5-3.4 Explain how waves, 5-3.4 Explain how waves,
currents, tides, and storms affect currents, tides, and storms affect
the geologic features of the the geologic features of the
ocean shore zone (including ocean shore zone (including
beaches, barrier islands, beaches, barrier islands,
estuaries, and inlets). estuaries, and inlets).
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BeachesBeaches
http://www.virtualtourist.com/travel/North_America/United_States_of_America/South_Carolina/Charleston-864816/Things_To_Do-Charleston-Beaches-BR-1.html
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The ocean shore zone, or coast,
is the area where the land meets
the ocean. Some shorelines are
rocky. Shorelines made of sand
are called beaches. Shorelines
are always changing because of
wind and water.
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Waves can wear away the land and expose a rocky shore or the
waves can deposit sand along the shore and form a beach. If the waves reach the beach at an
angle, the sand is moved along the coast.
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CURRENTS
Flowing streams of water that move continually through the ocean in a specific direction are called currents.
Some currents flow at the ocean’s surface and some are found deeper in the ocean.
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Currents, called longshore currents, along the shoreline can move sand from one location to
another.
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Surface currents are caused by the movement of Earth and by the force and direction of wind.
The movement of Earth and winds cause these currents to flow along curved paths.
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Warm water and cold water are moved to different regions on Earth as a result of currents.
Warm surface currents are driven by Earth’s rotation from the tropics to higher latitudes.
Cold surface currents are driven by Earth’s rotation from the polar latitudes toward the equator.
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Currents
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Tides can bring in sand, shells, and ocean sediments at high tide and leave them behind when the
tide goes out (low tide.)
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Tides
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• Storms can cause wave action that removes sand from beaches (like in hurricanes!)
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Barrier IslandsBarrier Islands
www.dnr.sc.gov/.../river/stewardship_gallery.htm
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Islands are pieces of land surrounded by water on all sides. Islands with sandy beaches are
called barrier islands.
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These barrier islands are naturally occurring and function to protect the mainland from the effects of
waves on its shore. As the waves deposit sand on the beaches, the
shapes of the barrier islands change.
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Currents can move the sand from
one end of the island to the other.
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EstuariesEstuaries
serc.carleton.edu/.../northinlet/index.html
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All rivers eventually flow into the oceans. The area where a river
meets the ocean is known as an estuary. Estuaries have a mixture
of freshwater and saltwater.
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Waves can deposit sand in the estuaries. At high tide ocean
water brings in sediments and sea life that feed and nourish life
in the estuary.
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Edisto River flows into the Atlantic Ocean
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Inlets are the water-filled spaces between the barrier islands.
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As the tides change, the amount of water in the inlet will change.
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Ocean currents and storms can change the shape of an inlet
opening.
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How many of you have been to Murrell’s Inlet or Little River?
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Large storms, for example hurricanes, can also cause massive destruction to the
shape of the beaches, barrier islands, estuaries, and inlets because they produce high waves and heavy winds.
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5-3.5 Compare the 5-3.5 Compare the
movement of water by waves, movement of water by waves,
currents, and tides. currents, and tides.
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EXPLAIN THE THREE WAYS
WATER CAN MOVE ON EARTH.
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1. WAVES
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WAVESWAVESThe repeated movement of water is known as a wave. All waves have the same parts. The highest part is known
as the crest and the lowest part is known as the trough. Most ocean
waves are caused by winds that are blown across the surface of the water.
A wave changes shape when it reaches the shore.
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2. CURRENTS
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CURRENTSCURRENTS
Flowing streams of water that move continually through the ocean in a specific direction are called currents. Some currents flow at the ocean’s surface and some are found deeper in the ocean. Surface currents are caused by the movement of Earth and by the force and direction of wind. The movement of Earth and winds causes these currents to flow along curved paths. Warm water and cold water are moved to different regions on Earth as a result of currents. Warm surface currents are driven by Earth’s rotation from the tropics to higher latitudes. Cold surface currents are driven by Earth’s rotation from the polar latitudes toward the equator.
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3. TIDES
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TIDESTIDES
Several times during the day, the level of water at the ocean shore changes. This regular rise and fall of waters in oceans and seas is called a tide. Tides are caused by the pull of the Moon’s gravity on Earth. As the Moon moves in relation to Earth, the water on Earth moves too. As Earth spins on its axis, the part of the ocean facing the moon will bulge. High tide occurs when the water level is at its highest point. Low tide occurs when the water level is at it lowest point. Tides rise and fall about twice a day.
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• Now for a STUDY JAM on Tides!
• http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/waves-and-currents.htm
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5-3.6 Explain how human 5-3.6 Explain how human
activity (including activity (including
conservation efforts and conservation efforts and
pollution) has affected the land pollution) has affected the land
and the oceans of Earth. and the oceans of Earth.
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Our Effects on the Ocean
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Key WordsKey Words
• Resource: A supply that meets a need for materials or energy.• Resources may include air, water, trees, rocks and minerals, soil, or
coal and oil.
• Conserve: To use wisely.
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Having a Having a Positive ImpactPositive Impact
We can:
1. Conserve resources
The wise use of natural resources is called conservation.
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• Human activities that help to keep the natural resources of Earth available and clear of pollution are conservation efforts.
• Some efforts involve everyone trying to reduce (use less of something), reuse (use something over again), and recycle (make something new from an old product).
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• Other efforts involve trying to save the land and oceans through clean-up projects, installing fence lines to prevent dune erosion or jetties along the entrance to harbors or groins along beaches in an effort to keep sand from washing away.
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The idea behind building groins on beaches is to prevent beach erosion.
As this photo illustrates, they work about half-right.
The beach is built up on one side of the groin but is severely eroded on the other side.
Beaches and "permanent" barriers don't mix!
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•Beach re-nourishment projects help to restore sand on beaches.
•Planting trees, bushes, or grass is a way to improve air quality as well as keep erosion from carrying away soil.
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•Pollution is anything that harms the natural environment.
•When the taking or using of natural resources causes harm to Earth’s air, water including oceans, or land, then the human activity has caused pollution.
POLLUTION
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•Oceans are rich in food, minerals, and other resources and can be easily polluted.
•Human activities can also harm the land and oceans causing resources to be polluted or destroyed.
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•Sometimes people may allow materials to be dumped into rivers not thinking that rivers flow into the estuaries and ocean where they are harmful to life there.
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•Careless dumping of trash on land or in oceans pollutes those areas.
• Smoke and fumes from burning fuels pollutes the air.
• Oil spills harm the oceans and can cause life there to be killed.
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•Careless human activities in agriculture, industry, construction, or mining can cause pollution on the land, in the water, and in the air.
•Let’s take a look at what I’m talking about.
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MiningMining
• The process of removing a resource from the ground.
• We mine coal (a fossil fuel) and iron (used in steel).
• Mining can be harmful by: changing habitats, causing pollution, increasing erosion when plants and topsoil are stripped from an area.
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Entrance to a Mine
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DrillingDrilling
• We drill for oil and other fossil fuels.
• Drilling can be harmful because it changes landforms and pollutes water resources and soils.
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Oil SpillOil Spill
• Can kill living things in ocean ecosystems.
• Very difficult to clean up.
• Can damage large areas for long periods.
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Limit the Damage to Earth’s OceansLimit the Damage to Earth’s Oceans
• Reduce your use of resources
• Reuse materials
• Recycle
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ResourcesResources
Magic School Bus Blows Its Top, The. Scholastic. 1995.unitedstreaming. 13 September 2006<http://www.unitedstreaming.com/> (23:56)
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