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volcanoes
| Question | Answer |
|---|---|
| volcano | a weak spot in the earth's crust |
| magma | a substance that comes from the mantle and is a mixture of rock-forming substances, gases, and water |
| lava | when magma reaches the surface |
| ring of fire | one major volcanic belt - formed by the many volcanoes that rim the pacific ocean plate boundaries |
| island arc | the resulting volcanoes creating a string of islands |
| hot spot | an area where magma from deep within the mantle melts through the (earth's) crust |
| magma chamber | beneath a volcano, magma collects in a pocket |
| vent | gas and molten rock leave the volcano through an opening |
| pipe | magma moves through tis long tube in the ground-which connects the magma chamber to the Earth's surface |
| lava flow | an area covered by lava as it pours out of a vent |
| crater | a bowl-shaped are that may form at the top of a volcano around its central vent |
| silica | |
| quiet eruption |