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Ch. 7-1/Volcanoes
8th grade science
| Question | Answer |
|---|---|
| Volcano | a weak spot in the crust where molten material, or magma comes to the surface |
| Magma | a molten mixture of rock-forming substances, gases, and water from the mantle |
| Lava | Liquid magma that reaches the surface |
| Ring of Fire | a major volcanic belt formed by the many volcanoes that rim the Pacific ocean |
| Island arc | a string of islands formed by the volcanoes along a deep ocean trench. |
| Hot spot | an area where material from deep within the mantle rises and then melts, forming magma |