12ESS volcano Test 1 revision

Which type of crust is more dense?

• Oceanic crust

• Continental crust

Which plate boundary types does NZ have?

• Convergent: subduction

• Divergent

• Transform

In the North Island which plate subducts down into the mantle?

• Australian plate

• Pacific plate

In the South Island which plate subducts down into the mantle?

• Australian plate

• Pacific plate

Which of these magma forming processes is happening during subduction?

• Water gets dragged into the mantle and breaks apart bonds

• Pressure is released at the surface by plates moving apart

• Heat is travelling upwards by convection currents

Which type of magma forms at a hot spot?

• Basaltic

• Andesitic

• Rhyolitic

Which type of magma forms when magma mixes with the crust?

• Basalt

• Andesite

• Rhyolite

Which type of magma forms when magma ponds under the crust and then the crust itself melts?

• Basaltic

• Andesitic

• Rhyolitic

Match the magma with its silica content

• Medium silica 55 - 65%

• Basalt magma

• Low silica 45 - 55%

• Andesite magma

• High silica 65 - 75%

• Rhyolite magma

Match the magma with its temperature:

• Medium temperature 800 degrees C

• Andesite magma

• High temperature 1000 degrees C

• Rhyolite magma

• Low temperature 600 degrees C

• Basalt magma