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HOMEWORK
• Review for Unit 4 Test (Remember Link will be sent)
• Pull Study Materials from teamwebsite mccarthyandoakes.weebly.com
****THIS SHOULD BE BOOKMARKED
Come to office hours today if you need help
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Unit 4 Review Jeopardy
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Unit 3 Review Jeopardy
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Objectives:
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RULES:
• Students will work through questions, using study guide if needed to answer
• Students will keep track of their points HAVE PAPER AND PENCIL HANDY
• Students will ask questions if needed!
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ARE YOU READDDDDDYYYYY?
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Categories
• The Continental Drift
• Tectonic Plates
• Plate Boundaries
• Plate Motion
• Seafloor Geography
• Stress
• Earthquakes and Volcanoes
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The Continental Drift
• Continental Drift - the slow movement of continental plates over earth´s surface
• Pangaea - the name scientists gave to a supercontinent that once existed on earth
• Theory of Continental Drift - the theory that the continents were previously joined together, and over time broke up and slowly drifted apart to their present positions
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Evidence
• Fossils
– Animals that would not have swam across an ocean but may have walked across a land bridge
• Mountain Chains
– Appalachian Mountains
• Rock Layers
– Evidence of glaciers in
warm areas, tropical swamps in cold.
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100 Points
• The theory of the continental drift says that a huge meteor smashed the earth and caused them to move.
• True
• False
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200 Points
• Which is evidence that supports the theory of the continental drift?
A. Erosion of coastlines
B. Matching fossils of different continents
C. Mountain chains
D. Both B and C
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TECTONIC PLATES
• Earth is composed of many plates – all are different sizes and shapes.
• The discovery of Earth’s plates helped explain the movement of the continents, as well as the cause of earthquakes and volcano eruptions.
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Three Kinds of Plate Motion 1. Mid-ocean ridges occur at divergent plate boundaries where
plates are moving apart and magma is surfacing. 2. At convergent plate boundaries, one plate pushes on the edge of
another plate, forming mountains for continental-continental plate collisions and deep-sea trenches for ocean-continental plate subduction.
3. Earthquakes occur at transform plate boundaries. Here, plates move in opposite directions alongside each other.
1. 2. 3.
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100 Points
• Define Convergent Plates:
A. Plates that move beside each other in the same directions at the same speed
B. Plates the come together, move towards each other or collide.
C. Plates that move in opposite directions
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200 Points:
• Define Divergent Plates:
A. Plates the move beside ach other in the same direction at the same speed.
B. Plates the collide.
C. Please that are moving apart in opposite directions
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300 Points
Define Transform Plates:
A. Plates move in opposite directions and slide past each other
B. Plates that collide and form mountains
C. Plates that move side by side in the same direction at the same speed.
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PLATE MOTION:
• The theory of plate tectonics explains that earth’s continents move as part of plates in the lithosphere. Scientists have identified about a dozen major tectonic plates as well as some smaller ones.
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What moves plates?
Two forces are the cause of plate motion: • Gravity and • Convection – the transfer of heat
by the circulation or movement of the heated parts of a liquid or gas. – Occurs because of differences in
density. – Heat from inner layers of the
earth provides energy • This heat causes rocks to melt and
makes the mantle flow
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Transferring Heat
Eventually these areas cool again – and the process continues. It results in a circular motion/ current – or convection.
Temperature Cools Density Increases Plate Sinks
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Transferring Heat : Convection
The cycle of convection is shown with the yellow arrows.
The process of convection is very slow
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When Plates Converge (Collide):
• Oceanic and Continental:
- SUBDUCTION- the oceanic plate is thinner and sliders UNDER the continenet crust
Continental and Continental:
-Push and fold up and crumpling can cause mountains to form
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100 Points
Subduction is when a plate slides under another plate.
TRUE FALSE
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200 Points
Convection does not causes tectonic plates to rise and fall as the heat and cool.
TRUE
FALSE
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Seafloor Geography and Spreading
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Vocabulary
• Abyssal Plain - a flat expanse of ocean floor • Bathymetric - a type of data collected from measurement of the depths of oceans, seas, or other
large bodies of water • Continental Rise - a region of gentle slope between the continental slope and the main ocean floor
• Continental Shelf - a shelf of undersea land reaching a depth of about 200 meters (656 feet),
extending out from the shoreline • Continental Slope - the relatively steeply sloping undersea land extending from the outer edge of
the continental shelf • Guyot - a seamount with a flattened top • Mid-ocean Ridge - a long, raised area in the ocean, with a depression or valley running along its top • Seamount - a volcanic mountain that rises from the ocean floor and has its peak underwater
• Submarine Canyon - a deep channel on the ocean floor, in the outer continental shelf, in the
continental slope, or in the continental rise • Paleomagnetism - magnetic qualities “frozen” into rocks when they are formed, including the
direction of the magnetic field
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100 Points
Seafloor spreading came from a simple idea: magnetism
TRUE FALSE
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200 Points
The ocean floor has many qualities and formations similar to those found on the continental crust.
TRUE FALSE
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Stress on Plates
Earth's plates fit together snugly, and many are quite large. If one plate moves or a force is exerted on part of it, it may push on other plates or push or pull on another part of the same plate. This may cause three different types of stress on plates: Compression, Tension and Shear
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Compression
squeezing the rocks of the crust
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Tension
pulling the rocks and causing them to stretch or pull apart over a large area
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Shear
pushing the rock of the crust in two opposite directions alongside one another, resulting in a
simple bend or break
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Faults • When movement happens faults, or breaks in the rock, can
develop. The line the rock beaks along is called the fault line. • The rock that leans on the top of the fault line is called the hanging
wall. The rock block that is being leaned on is called the foot wall. • The terms foot wall and hanging wall come from mining. Imagine a
miner in a mine underground along the crack of the fault line. The foot wall is the sloping wall on which a miner could most easily rest his or her foot. The hanging wall is the one that would be hanging over the miner.
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100 Points
TRUE FALSE
When the hanging wall of a fault rises about the foot wall, it is called
a reverse fault.
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200 Points
TRUE FALSE
Compression is a type of stress where the crust moves in opposite
directions.
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EARTHQUAKES AND VOLCANOES
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Hot Spots
Hot springs and geysers occur over hot spots, where rock from the mantle transfers heat to water near the surface of the earth. Many hot springs are a few degrees warmer than the surrounding air. Other hot springs contain water that is almost at the boiling point. In geysers, water boils below the surface and then forces a fountain of water up into the air – like Yellowstone’s Old Faithful.
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Making Waves
Earthquakes produce two types of seismic waves, which travel in different ways. The first are pressure waves, or P waves for short. They contract and release as they move very quickly.
The second type of seismic wave is an S wave. S waves move more like a rope. That means they move sideways and back and forth compared to the direction the wave is traveling. They do not travel as fast as P waves.
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Seismographs!
Sensitive instruments are able to detect very slight movements in the earth’s lithosphere. A seismograph is an instrument that can detect vibration in the earth. As seismic waves move through the earth, a seismograph detects the vibrations, and then represents them with a line drawn on paper, called a seismogram. Below are two sample seismograms. Which one do you think was produced during an earthquake?
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100 Points
• What is a hotspot?
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200 Points
What are the two types of seismic waves?
A. High and Low
B. P and S
C. X and Y
D. A and S
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HOMEWORK
• Review for Unit 4 Test (Remember Link will be sent)
• Pull Study Materials from teamwebsite mccarthyandoakes.weebly.com
****THIS SHOULD BE BOOKMARKED
Come to office hours today if you need help