Plate tectonics Flashcards
1
Q
Who proposed the idea of Continental Drift Theory?
A
Alfred Wegener In 1912
2
Q
What is the Continental Drift Theory?
A
The theory states that 250 million years ago, all of the continents were combined into one super-continent called “Pangea”.
3
Q
How many plates are made up into earth crust?
A
12
4
Q
What is a Mantle convention current?
A
- A current in the mantle where cooler, denser material sinks, and warmer less dense material rises.
5
Q
What is Plate Tectonics Theory?
A
- Plate tectonics is a theory that states that the earths outer layer, the lithosphere, is divided into large continent-sized plates that are constantly moving,
6
Q
How do plates move?
A
- Because of mantle convention currents
