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Gr. 8: Ch.3, Section 1: Volcanoes and Plate Tectonics
Key Terms and Definitions
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| volcano | a weak spot in the crust where magma has come to the surface |
| magma | the molten mixture of rock-forming substances, gases, and water from the mantle |
| hot spot | an area where magma from deep within the mantle melts through the crust above it |
| Ring of Fire | a major belt of volcanoes that rims the Pacific Ocean |
| island arc | a string of islands formed by the volcanoes along a deep ocean trench |
| lava | liquid magma that reaches the surface; also the rock formed when liquid lava hardens |
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