Volcanic Eruptions - Challenging

1. What keeps the magma under the ground?

• Lithostatic pressure - earth pushing down

• Magmastatic pressure - magma pushing up

• Rock strength

• All 3 of the answers

2. What is magma made of?

• dissolved gasses and melted glass

• dissolved gasses and melted minerals

• dissolved rocks and melted minerals

3. What can happen if the weight of the rock above the magma becomes too low?

• It can trigger an eruption

• It can trigger an earthquake

• It can start a tsunami

4. What is it called when the weight of the rock above the magma becomes to low?

• uploading

• unloading

• losing weight

5. What causes unloading?

• Landslides, errosion and melting glaciers

• Only errosion and melting glaciers

• Only melting glaciers

6. What happens during 'hydrothermal alteration'?

• soft clay is tirned into hard stone

• hard stone is turned into soft clay