Starter

Where and what type of volcano occur in there? Watch first.

Starter

Where and what type of volcano occur in there?

• Divergent (constructive) sea-floor spreading
  - plate boundaries and mid ocean hotspots produce low viscosity lava which creates shield type volcanoes.
• Convergent (destructive) subduction zones
  - plate boundaries on the edge of continent produce high viscosity lava which leads to explosive eruption and cone stratovolcano.

TASK 1:

Using Hodder textbook p.194 (4th edition), research:

• What are Magma plumes?
  - Magma plumes are areas of hot, upwelling mantle.
• What is a Hot spot?
  - develops above the plume in the crust.
  - example: the Hawaiian hot spot (Figure 5.13) - the Pacific plate is moving northwest (see also Figure 5.14)
  - is stationary, so as the Pacific plate moves over it, a line of flattish volcanoes ('shield') is created.
  

TASK 2:

Draw a diagram to show how the Hawaiian islands formed. Explain the pattern of creation of the hot spots.