Tectonic Formations

Question 1

Rift Valley formation

Answer 1

1. Constructive boundary moves apart convection currents
2. Heat flows through cracks creating bulges, stretching and fracturing plate
3. Leads to chunks of crust to descend
4. Areas on other side of valley rise creating Horst
5. Area pulled leads to material bursting, forming flood basalts

Question 2

Ocean trench formation (similar to fold mountain )

Answer 2

1. Form at destructive boundaries
2. Dense oceanic plate melts or slides beneath continental plate - subjecting to create a trench underwater

Question 3

Fold mountain formation

Answer 3

• Form at destructive boundary
• Dense oceanic plate melts or slides beneath continental plate - subjecting to form fold mountain on land

Question 4

Volcano formation

Answer 4

1. Volcanoes form when magma from upper mantle in hotspot reaches its way to the surface
2. Magma either forced out by converging boundaries or fills space left, erupting creating more material and growing further