Plate tectonics Flashcards
1
Q
What are the 2 waves that pass through earth?
A
Pressure waves
Shear waves (can’t pass through core)
2
Q
What did gravity help us find?
A
how much mass is in the earth and what layers are made of
3
Q
What was our development of plate tectonics?
A
- Fitting continents
- Matching rocks (fossil overlap)
- Continental drift
4
Q
What are the 6 pieces of evidence for plate tectonics?
A
1) Bathymetry and Harry Hess, line soundings measure depths
2) Magnetism, map floor magnetic field
3) Deep sea drilling, collect rock samples
4) Earthquake distribution
5) Island arcs
6) GPS, black smokers
5
Q
What are the 3 types of tectonic plates?
A
Transform- fault //
Divergent < >
Convergent > <
6
Q
What do divergent boundaries create?
A
mid ocean ridges and rift valleys
7
Q
What do convergent boundaries create?
A
Trenches, mountain chains and island arcs
