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13 Cards in this Set
- Front
- Back
volcano
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a volcano is a weak spot in the crust where molten material comes to the surface
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magma
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molten rock
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lava
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molten rock once it reaches the surface
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Ring of Fire
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A ring of volcanoes around the pacific plate.
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Where do volcanoes form?
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around diverging plate boundaries and converging plate boundaries
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How are island arches formed?
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When two plates converge, the denser plate sinks under the less dense one, and some of the crust there melts and becomes magma, which rises, breaks through a weak spot, and forms volcanoes or volcanic islands as it moves along.
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hot spot
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an area deep within the mantle that rises and then melts, forming magma
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physical property
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any characteristic of a substance that can be observed or measured without changing the composition of the substance
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chemical property
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any property that produces a change in the composition of matter
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viscosity
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the resistance of a liquid to movement
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2 parts that effect magma's viscosity
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the more silica, and hotter it is, the higher the viscosity
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Aa
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a slow moving cool lava witch is jagged when cooled
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Pahoehoe
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a fast moving hot lava that is smooth an wrinkly when cooled
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