Volcanoes

6. chamber – an underground reservoir where magma collects before an eruption.
7. – an opening in a volcanic area that releases steam and volcanic gases.
9. volcano – a volcano that is not expected to erupt again.
11. – a fast-moving flow of volcanic mud, ash, and water down the slopes of a volcano.
15. volcano – a volcano that is inactive but may erupt again in the future.
16. ash – fine particles of rock and volcanic glass ejected during an eruption.
17. – fragments of volcanic material thrown into the air during an eruption.
18. – an opening through which volcanic material escapes to the surface.
20. – a bowl-shaped depression at the top of a volcano surrounding its main vent.

1. volcano – a steep-sided volcano built from alternating layers of lava and volcanic ash.
2. cone – a small, steep volcano formed from loose volcanic fragments around a vent.
3. – the release of lava, ash, gases, and rock fragments from a volcano.
4. – molten rock that erupts onto Earth's surface.
5. volcano – a broad volcano with gentle slopes formed by fluid lava flows.
8. – molten rock found beneath Earth's surface.
10. – a large depression formed when a volcano collapses after a major eruption.
12. volcano – a volcano that is erupting or has erupted in recent geological history.
13. – an opening in Earth's crust through which magma, gases, and ash are released.
14. bomb – a large piece of molten rock ejected from a volcano that solidifies before reaching the ground.
19. flow – a fast-moving mixture of hot gas, ash, and volcanic rock that flows down a volcano's slopes.