Restless Earth Flashcards
0
Q
How do plates move?
A
Convection currents that are constantly moving in the mantle.
1
Q
What is the structure of the earth?
A
1) Crust
2) Mantle
3) Outer core
4) Inner core
2
Q
What happens at constructive plate boundaries?
A
- Two plates move apart
- Magma rises and fills the gap
- Not much force when erupting
MID ATLANTIC RIDGE
3
Q
What happens at destructive plate boundaries?
A
- Continental meets oceanic plate
- Oceanic sinks underneath
4
Q
What happens at collision plate boundaries?
A
- Similar density plates
- Material between buckles
- Forms fold mountains
THE HIMALAYAS or ALPS
5
Q
What happens at conservative plate boundaries?
A
- Plates slide past each other
- Occurs at a fault (weakness)
- No volcanoes, only earthquakes
SAN ADREAS FAULT, CALIFORNIA
6
Q
What is an ocean trench?
A
An ocean trench is a long, narrow and deep depression in the ocean bed, typically parallel to a plate boundary or making a subduction zone.
