Plate Tectonics Flashcards
1
Q
What are the layers of the Earth and their compositions?
A
Crust
Mantle
Outer Core
Inner Core
2
Q
Crust:
A
The outermost layer; solid rock, divided into continental (thicker but less dense) and oceanic crust (thinner but denser).
3
Q
Mantle:
A
Semi-solid, composed of silicate rocks, with convection currents that drive plate movements.
4
Q
Outer Core:
A
Liquid iron and nickel, responsible for Earth’s magnetic field.
5
Q
Inner Core:
A
Solid iron and nickel, extremely hot and dense.
6
Q
Who was Alfred Wegener, and what was his contribution to plate tectonics?
A
Alfred Wegener proposed the Continental Drift Theory in 1912, suggesting that continents were once joined as a supercontinent (Pangaea) and have since drifted apart.
