2.1 Ocean BasinsFill in the oceans

Pacific

Southern

Indian

ArcticAtlantic

Pacific

Read together p 38, b) What is a basin?

A basin is a low spot in Earth’s surface that is completely or partially surrounded by higher land.

similar?

If the sink is the “ocean basin”

….what is the “higher ground”?

Ocean Basin: is all that is in BLUE -

c) Where do scientists believe that water in the ocean originated? (2 sources) p.401. Water trapped inside the volcanos was also released into the

atmosphere in the form of water vapour (gas)—as it cooled and condensed, it fell to Earth as precipitation (liquid). Gravity pulled it down to the lowest parts of Earth’s surface, the “ocean basins”.

OR

2. Came from ice in comets that hit the young Earth.

d) LABEL: (see fig 2.8, p.43), and colour the ocean blue and crusts/ground brown

Do the Rest of the questions ON LOOSE-LEAF:

Why? Because I am marking this…

What you do not get done in class, finish at home,These are your notes!

(My slides will be up for you to use...copy from)

e) Define and explain how each was created:Ocean Ridge: (p.42) When two plates are pushed apart, the underlying magma oozes up and quickly hardens, and forms long, undersea mountain chains.

e) Define and explain how each was created: Trench: (p.42)

When an oceanic plate collides with a continental plate, the denser ocean plate is forced to bend steeply down beneaththe less dense continental plate which makes a trench.

Most occur around the margin of the Pacific Ocean.

OCEAN plateContinental

plate

TRENCH

Ring of Fire...

e) Define and explain how each was created: Abyssal Plains (p.43)

● Wide, flat open features of the ocean floors● Thick deposits of sediment, up to 1 km deep.● Comes from land on the continent● Brought to ocean edge by river runoff● Reach sea floor by underwater landslides caused by

earthquakes or by gravity

What does “Abyss” mean?

Note the Abyssal Plain:

f) Name 3 modern technologies that have helped scientists explore the deep ocean.1. Sonar mapping2. Satetellites3. Submersibles4. Deep Sea Cameras and Video

g) Describe the process of Sonar Mapping (p.44) (or draw a well labelled picture)

● uses sound waves to probe the seabed

● the depth of water is found by sending sound waves directly down from a ship

● Then measure the time it takes for the signals to hit the sea floor and bounce back to the surface.

h) What are 2 advantages of Satellite Mapping? (p.45, first paragraph)

● satellites can survey very large areas of oceanin a relatively short time

● able to record and transmit data in all kinds of weather, and in both day and night

Is there a downside?....$$$$