Plate Tectonics Review . 1. List and describe the layers of the Earth in order from the interior out. Inner core – hot, solid iron and nickel Outer core – hot, molten iron and nickel Mantle – hot rock Crust – solid outer layer of the Earth.
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At the mid-ocean ridge through sea-floor spreading
19. floor?Explain the 3 types of convergent boundaries and what each produces.
Convergent oceanic and oceanic plates – 1 plate is subducted (the more dense plate) through a trench and forms a chain of volcanic islands
Convergent oceanic and continental plates – oceanic is more dense and is subducted under the continental plate. Volcanoes on land are produced.
Convergent continental and continental plate – 2 continental plates collide, crust buckles and mountain ranges are formed.
20 floor?. The Earth has a magnetic field because of the __________.
21. floor?What is the difference between continental and oceanic crust? Why is ocean crust younger than continental crust?
Oceanic crust is more dense than continental crust. It alsomoves through the rock cycle faster than continental crust. New ocean crust is created at the mid-ocean ridge and old ocean crust is subducted at a trench.
22. floor?What happens at trenches on the ocean floor?
Oceanic crust is pushed back into the mantle and forms molten material (subducted).