Plate Tectonics Flashcards
1
Q
3 signs that continents have drifted
A
- Continental shelf margins (South America fitting into Africa like a puzzle
- Continuous rocks over different countries
- Ancient glacier features on several countries
2
Q
What causes the continental drift?
A
Sea Floor Spreading
3
Q
What is proof of sea floor spreading
A
The Mid Atlantic Ridge and Palaeomagnetism
4
Q
What is The Mid Atlantic Ridge
A
Forming of oceanic crust and pushing old crust sideways
5
Q
What is Palaeomagnetism
A
Earths magnetic field. The geographic and magnetic north pole usually coincide but sometimes reverse
6
Q
What is plate movement caused by
A
convection
7
Q
What are hotspots/Mantle plumes
A
Stationary upwell of heat from the mantle
8
Q
Where does most fertile soil come from
A
Hotspots
