Volcanoes

1. the molten, fluid rock that issues from a volcano or volcanic vent.
3. is a bowl-shaped depression, or hollowed-out area, produced by the impact of a meteorite, volcanic activity, or an explosion.
5. the pipe or vent at the heart of a volcano where material wells up from beneath the surface.
7. rushes down a volcano and into river valleys, it incorporates water, snow, trees, bridges, buildings, and anything else in the way.
9. become active and eject lava, ash, and gases.
10. a scientific field that uses the techniques and methods of structural geology, tectonics, and physics to analyse and interpret physical processes and the associated deformation in volcanic areas, at any scale.
12. the action of volcanic debris on the atmosphere, land and water.
13. releases water vapor and toxic gases into the atmosphere.
14. involving or causing sudden great damage or suffering.

2. a volcano that has had at least one eruption during the past 10,000 years.
4. no longer in existence; having ended or died out
5. is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice and ash.
6. relating to the study of the earth's physical structure and substance.
8. to refer to volcanoes that are capable of erupting, and will probably erupt again in the future, but hasn't had an eruption for a very long time.
11. liquefied by heat; in a state of fusion.
12. force or throw (something) out, typically in a violent or sudden way.