1.3 Volcanism

Question 1

Volcanoes occur….

Answer 1

Along plate boundaries

Question 2

Volcanoes can be … but also …

Answer 2

Dormant
Active

Question 3

A volcano is build up by…

Answer 3

Lava and ash

Question 4

When is lava formed?

Answer 4

Lava is formed when the rock of the ocean floor is pushed down into the mantle and becomes so hot that it melts

Question 5

When does a volcano erupt?

Answer 5

When a lot of magma has been formed and it’s onder great pressure

Question 6

How do you call the place where the magma comes out?

Answer 6

Crater

Question 7

How do you explain a mid-ocean ridge?

Answer 7

2 parts of the ocean floor are pulled apart. This creates a crack in the ocean’s crust which is filled with red-hot rock which solidifies

Question 8

Explain accumulate

Answer 8

Ash and lava is layered like dish of lasagne

Question 9

Explain red-hot clouds

Answer 9

Hot gases mix with fine ash which form clouds that race down the vulcano with a speed over 100 km p/h

Question 10

What are signals that a volcano will erupt?

Answer 10

1. You’ll feel vibrations
2. Smoking
3. Animals become restless
4. Satellites and vibration metres