Volcanoes

Why is there heat in the Core?

• Because there are volcanoes.

• Because there are magma chambers.

• Because we are close to the Sun orbit.

• Because it was left when the planet was formed.

If the magma is less dense than the rock from which it melted. It should go ..... Remember convection currents

• up

• down

The density of magma depends on its____________, the amount of dissolved gas and its temperature.

Magma can keep afloat on liquid and gas. (buoyant)

• No

• Yes

Where can volcanoes occur? Choose 3

• Around divergent plate boundaries.

• Around convergent plate boundaries.

• Around transform plate boundaries.

• Hot spots

• All of the above

The type of the eruption is determined by the composition of the magma.

• No

• Yes

Which of the following components can cause a violent eruption?

• Lava with more iron and magnesium, less silica.

• Lava with silica (silicon and oxygen).

What builds up pressure in the magma?_______________