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Flashcards in Plate Tectonics Deck (22):
1

Describe and differentiate between the Lithosphere and the asthenosphere?

Lithosphere- the outer shell of the Earth consisting of the crust and uppermost portion of the mantle
Asthenosphere- the partially melted layer of the mantle that underlies the lithosphere

2

List the five key pieces of evidence cited by Alfred Wegener supporting his theory of Continental drift

1)shapes matched
2)fossils matched
3)Rocks matched
4)glacial striations match
5)ancient climate evidence does not match current

3

Name two continents that fit together very well

South America and africa

4

Why do the coastlines not fit together perfectly?

erosion

5

Why was Wegener's theory of continental drift not accepted?

it was difficult to believe that the continents moved through the solid rock of the sea floor

6

Differentiate between the theory of continental drift and plate tectonics

continental drift- a hypothesis that Earth's continents move on Earth's surface
Plate tectonics- the theory that the lithosphere is made of plates that move and interact with each other at their boundaries

7

What geological events provide evidence for plate tectonics and helps to identify plate boundaries

earthquakes and volcanoes

8

List the 5 plate boundaries and a resulting feature and a location where it occurs

Converging- Oceanic to Oceanic- island arc, Japan
Converging- Oceanic to Continental- volcanoes, andes mountains
Continental to continental- mountains, himalayan mountains
Diverging- mid ocean ridge, Rift Valley, mid atlantic ridge East African rift
Transform- fault, San Andreas fault

9

What are the three pieces of evidence for sea floor spreading?

rock similarities
fossils
how the continents fit together

10

What is a rift?

a crack or opening in earth's crust

11

At what type of plate boundary is a Rift Valley found?

Diverging

12

Differentiate between a collision boundary zone and a subduction boundary zone.

collision- plates collide and fold into mountains
subduction- plates collide, one subjects below

13

Collision and subduction are both examples of what major boundary type?

Converging

14

Why, at a subduction boundary, does one plate over-ride the other?

because one is less dense than the other

15

Which typeof plate never subducts?

continental

16

What drives plate tectonics?

the lithosphere

17

True or False. Pangea began to break up about 200mya. Today the plates have all separated and in fixed positions.

False. They are not in fixed positions

18

Name and area of high heat flow

the ring of fire

19

Are fossils living things?

they once were

20

The fossil record of the prehistoric lizard Mesosaurus, was found on which two continents?

South America and Africa

21

Where would you find a trench?

A converging subduction boundary

22

How did the Hawaiian Islands chain of sea mounts form?

they were over a hot spot