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Flashcards in Structures of Earth Deck (9)
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1

what are the 3 layers the earth is made up of?

1) the crust

2) the mantle

3) the core

2

what does the crust consist of?

it's made up of granite, basalt, gabbrro and other types of rock

3

what s the mantle made up of?

It consists of silica and metal-rich minerals

4

what are the 2 layers of the core?

the inner core - made mostly of iron
the outer core - made mostly of liquid

5

what are the 3 types of plate margins?

1) constructive margin

2) destructive margin

3) conservative margin

6

explain the constructive margin?

when 2 plates are moving apart and new crust is forming. molten material from the mantle wells up in the space between the plate, hardens and forms new crust.

7

explain the destructive margin?

When 2 plates are colliding and crust is being destroyed. When 2 plates consisting of an oceanic and a continental, the oceanic may be forced under the other plate.

8

explain the conservative margin?

when 2 plates are sliding by one another, and no crust is created or destroyed.

9

what is the theory of pangea?

that a single continent named pangea existed about 250 million years ago, it gradually broke apart and over millions of years the pieces drifted into the locations they are in today.