Click on destructive boundary where fold mountains and a volcanic arc is found.
Question 5
5.
Click on collision zone where the Himalayan fold mountains are formed.
Question 6
6.
Click on the destructive plate boundary where two oceanic crusts are converging.
Question 7
7.
Click on the constructive margin where a rising plume of magma is creating a rift valley.
Question 8
8.
Click on the conservative margin known as the San Andreas fault.
Question 9
9.
Name the process from the spec: basaltic oceanic crust is created and then moves laterally away from the linear fracture. More oceanic crust is created and a conveyer belt process occurs so that older crust moves further away from crust on the other side of the boundary. This creates large ocean basins and means the Americas are getting further from Europe and Africa.
Question 10
10.
What is the thickness of the Earth's crust?
10 to 50km
0 to 100km
10 to 500km
0 to 10km
What is the name for the layer of crust and upper mantle consisting of solid, brittle rock?
Mantle
viscoelastic
asthenosphere
lithosphere
What is the difference between ocean trenches and ocean ridges?
trenches are found at subduction zones and may be up to 11km deep whereas ridges are formed above upwelling plumes of magma from the mantle.
ocean trenches are short features found where dense old crust is subducted whereas ocean ridges are much longer linear features where new continental crust is created.
ocean trenches are associated with volcanic activity (vulcanicity) whereas ocean ridges are not.
ocean trenches are formed on conservative margins and are made of granite whereas ocean ridges are found at collision zones such as the Himalayas.
