Divergent Plate Boundaries Flashcards
1
Q
Oceanic crust composition
A
Deep-marine sediment
Pillow basalt a
Sheet dikes
Gabbro
2
Q
Oceanic ridge above sea level example
A
Iceland
3
Q
Type of rock at divergent boundary
A
Igneous made from decompression melting of rising mantle rock
4
Q
Decompression melting
A
Melting occurs because of a decrease in pressure
5
Q
Seafloor metamorphism
A
Chemical action of fluids is major agent of change
6
Q
Metabasalt
A
Metamorphic rock most abundant bear earths surface
7
Q
Abyssal hills
A
Form most abundant landform on earth (30%)
8
Q
Abyssal plains
A
Sediment covered abyssal hills to form flat plains
9
Q
Continental rifts
A
Divergent plate margins developed in continents
10
Q
Mid ocean ridge
A
The creation of new oceanic crust marking a divergent plate boundary
