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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 |