Plate Boundaries

Question 1

Divergent

Answer 1

Plates pull apart from one another.
Commonly Mid ocean ridges.
Material is being added between the ridge.
Type of stress: Tension

Question 2

Convergent

Answer 2

Where material is being destroyed.
One plate subduction beneath another.
Oceanic plate moving below continental plate.

Question 3

Conservative

Answer 3

Plates sliding past one another.
No material is added nor subducted.
Pressure build up can cause huge quakes.

Question 4

Collision

Answer 4

Where two continental plates meet.
Subduction ceases.
Type of stress: compression

Question 5

Slab Pull

Answer 5

Colder, denser oceanic plate sinks due to gravity, into the subduction zones.
Dragging the rest of the plate with it.
E.g. Aleutian trench

Question 6

Convection Drag

Answer 6

Convection within the mantle pulls the plate into the subduction zones.

Question 7

Ridge Push

Answer 7

Intrusion of magma into ocean ridges (e.g.Mid-Atlantic) propels plates apart.

Question 8

Lithosphere

Answer 8

Earths crust and rigid upper part of the mantle.

Question 9

Asthenosphere

Answer 9

Semi-molten part of the mantle. What plates float on.

Question 10

Metamorphic rock

Answer 10

Formed by the heat and pressure of the mantle.
Heat applied by tectonic subduction and intrusion of magma gives interlocking crystals.
e.g.Marble

Question 11

Igneous rock

Answer 11

Formed when magma cools.
Factors such as rate of cooling, composition of magma, and temperature of solidification affect crystallisation process.
Non-porous
E.g. Granite and basalt.