Plate Tectonics Flashcards
1
Q
Continental crust
A
Less Dense, made of granite, thicker
2
Q
Oceanic Crust
A
More dense, made of basalt, thinner
3
Q
Continental Drift
A
Continents have moved over time
4
Q
Plate Tectonics
A
Our crust is made of different moving pieces
5
Q
Convergent PB
A
2 plates come together
6
Q
Subduction
A
More dense plate goes under
7
Q
Trench
A
Very deep valley created by subduction
8
Q
Divergent PB
A
2 plates move apart
9
Q
Mid-Ocean Ridge
A
Mountains range on ocean floor where crust splits
10
Q
Rift Valley/Rift Zone
A
Valley created when crust splits
11
Q
Transform PB
A
2 plates slide past eachother
12
Q
Convection
A
Energy flow in fluids (causes plate tectonics)
13
Q
Epicenter
A
Spot on surface where the earthquake begins
14
Q
Focus
A
Exact spot underground where crust breaks
15
Q
P wave
A
Primary earthquake wave - faster
