Physical Enviroment - Natural Hazards - Tectonic Hazards Flashcards
1
Q
Tectonic Plates
A
Slabs of the Earth’s crust that float on the mantle
2
Q
2 types of crust
A
Continental and oceanic
3
Q
Continental
A
Thicker crust (30-50km) and less dense
4
Q
Oceanic
A
Thinner crust (5-10km) more dense
5
Q
Three types of plate margins
A
Destructive Margins
Constructive Margins
Conservative Margins
6
Q
Destructive Margins
A
Where two plates are moving towards each other
Oceanic + Continental = Oceanic in mantle creating volcanoes and ocean trenches
Continental + Continental = Ground folded upwards creating mountains
7
Q
Constructive Margins
A
Two plates move away from each other. Magma then rises, cools and forms land/new crust
8
Q
Conservative Margin
A
Two plates move sideways against each other or in the same direction but at different speeds. No crust is lost or gained here
