Constructive Plate boundaries

Question 1

Explain stage 1 of the constructive plate boundary

Answer 1

(There is normally a 30km to 40km thick continental lithosphere over the asthenosphere)

Convection uplift from the asthenosphere leads to the stretching and arching of the crust

Question 2

Explain stage 2 of the constructive plate boundary

Answer 2

Crust fractures
Magma reaches surface
Slump occurs and Rift Valley is formed

Question 3

Explain stage 3 of the constructive plate boundary

Answer 3

Plate begins to separate by sea-floor spreading

Shallow linear sea forms above new ocean crust

Question 4

Explain stage 4

Answer 4

Sea widens
Submarine volcanic activity
Broad mid-ocean ridge develops as magma rises, cools forms basalt

Question 5

Explain stage 5

Answer 5

Shallow earthquakes caused my magma movement rising to surface

Question 6

Give an example of stage 2 rift valley

Answer 6

Great Rift Valley in East Africa, Kenya

Question 7

Give an example of stage 3 shallow linear sea

Answer 7

Red Sea

Question 8

Give an example of stage 4 mid-ocean ridge

Answer 8

Mid-Atlantic Ridge; new material constantly created and linear submarine mountains formed (reachign 3000m high)

Question 9

Draw a Constructive Plate Margin

Answer 9

Ye