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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 |