Mid Ocean Ridge
1. Read the two paragraphs on page 150.
2. List 3 places on the map page 150 where a mid-ocean ridge can be found.
3. What is a mid ocean ridge?
4. What is unusual about Iceland
Sea Floor Spread
1. Using your own words explain Sea-Floor Spreading.
2. Where does Sea-Floor Spreading occur?
3. What does Sea-Floor Spreading do to the ocean floor?
Evidence for Sea-Floor Spreading
Name the 3 types of evidence
What do pillows have to do with it?
What does the picture show?
What do the iron bits do?
What does age have to do with it?
Summarize using your own words why rock age is evidence for Sea Floor Spreading.
Subduction at Trenches
Page 154 Paragraph 1
What is a deep-ocean trench?
Using your own words describe what happens to the Earth’s crust at a deep-ocean
The Process of Subduction:
What process works along with Subduciton?
What does the ocean floor move like?
Subduction and Earth’s Oceans
What happens when Subduction and Sea-Floor Spreading work together?
Why is the Pacific Ocean shrinking?
Why is the Atlantic Ocean growing?
Draw and Label the Picture found on page 154
Summarize what is happening in the picture
Use the following terms:
Identify the cookie half with the most cream left on it and use that half.
Next, slowly insert that half in your mouth, scraping off the cream onto your front
According to Exploratorium, the creation of fault lines occurs as "an oceanic plate
dives under the continental plate," and "layers of the sea floor are often scraped
off and plastered onto the edge of the continental plate next to it."
This action creates accretion, "an important process in the building of the
As the "edge of the continental crust bulldozes off the top layers of the subducting
oceanic crust," your teeth were doing the same kind of "bulldozing," the scraping
off of the cream filling rather than the sediments.
What page in Chapter Section 5 shows 2 examples of this process?