landforms associated with plate movement

Question 1

types of plate boundary

Answer 1

constructive - plates move apart
destructive - plates move together and subduct
conservative - plates slide past each other

Question 2

ocean ridges

Answer 2

formed at constructive plate boundaries
space between plates is filled wit basaltic lava, forms ridge
forms submarine volcanoes (plumes of magma erupt)
e.g. mid-atlantic ridge

Question 3

rift valleys

Answer 3

formed at constructive plate boundaries
valleys form when plates move apart in continental areas, areas of crust sink between parallel faults to form a valley
e.g. East African Rift Valley

Question 4

deep sea trenches

Answer 4

formed at destructive plate boundaries where crust is lost
oceanic and continental move towards each other
e.g. marianas trench
formation of island arcs:
- oceanic crust melts again at Benioff zone, melted crust has lower density and so rises and solidifies to form new land

Question 5

fold mountains

Answer 5

formed at destructive plate margins where continental and continental crust meet
when meet forms fold mountains
e.g. Himalayas (Indian and eurasian plate)