Volcanoes

Watch the video and compete the sentences. Speak about volcanoes:
1. Volcanoes eject  ... high into the atmosphere.

2. Pressure builds up, then releases suddenly, causing the magma to explode. It's a  ... .
3. Magma which reaches the Earth's surface is called ... .
4. Lava eventually cools to form ... . After more eruptions the mount of rocks build up and form ... .
5. Volcanoes have the same structure:
a)
b)
c)
d)
6. Eruptions occur when ... .
7. Hot lava can destroy ... .
7. Volcanoes are essential for ... .They formed ... .
8. They may be ... , but they may also become ... . Eventually they may become ... and never ... .