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Grade Six - Volcano
Terms from Prentice Hall Earth Science
| Term | Definition |
|---|---|
| volcano | a weak spot in the crust where magma comes to the surface |
| magma | molten mixture of molten material including rock-forming materials, gasses and water from the mantle |
| lava | magma when it reaches the surface of the crust |
| Ring of Fire | a major belt of volcanoes that rims the Pacific Ocean |
| island arc | a string of islands formed by volcanoes over a deep-ocean trench |
| hot spot | an area where magma from deep in the mantle melts through the crust above it |
| magma chamber | a pocket below the crust where magma collects |
| pipe | a long tube in the ground that connects the magma chamber to Earth's surface |
| vent | the opening in the crust |
| crater | bowl shaped area that may form at the top of a volcanic mountain around the central vent |
| viscosity | resistance of a liquid to flow. |
| silica | a compound of silicate and oxygen that determines the viscosity of lava |
| pyroclastic flow | a mixture of hot gases, ash, cinders and bombs that erupt explosively |
| caldera | the huge hole left by the collapse of a volcanic mountain |
| sill | landform made when magma squeezes between horizontal layers of rock. |
| dike | landform made when magma forces a path across rock layers |
| batholith | large rock mass |
| geyser | a fountain of water and steam that erupts from the ground |
Created by:
pkolarich
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