Plate Tectonic Theories Flashcards
1
Q
Lithosphere
A
Surface layer of the earth which is rigid and composed of the crust and upper mantle. 100km deep on average. The lithosphere is always moving (but slowly)
2
Q
Oceanic crust
A
Thin, underlies ocean basins, made mainly of basalt. High density
3
Q
Continental crust
A
Thick, underlies continents, made mainly of granite, lower density
4
Q
What was wegeners evidence
A
Jigsaw fit
Geological fit
Tectonic fit
Glacial deposits
Fossil evidence
5
Q
What was wegeners published work?
A
Theory of continental drift
6
Q
What did wegener do?
A
Named the supercontinent Pangea and later it had split into two continents Laurasia (north) and Gondwanaland (south)
7
Q
What was wegeners theory
A
A single continental existed 300 million years ago
8
Q
When was wegeners theory
A
1912
