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12 Cards in this Set
- Front
- Back
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Magma
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within the earth's surface there is enough pressure and heat to cause rocks to melt and form magma.
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How far down is the deepest magma can be found
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150 km
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What are the ranges in the temperature of magma
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650-1200 degrees celcius
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Why does magma float to the surface
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its less dense then solid rock
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Intrusive
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igneous rocks that are formed within the earth as magma cools slowly- course grained
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extrusive
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rocks that form on the earth's surface
fine grained |
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Volcanic glass
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these rocks cool so quickly that very few mineral crystals form. Atoms are not arranged in repeating patterns examples include: obsidian, Pumice, and Scoria the glass which tries to escape creates a porpous appearence
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What are the three different molten rocks from which igneous rocks form.
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Balsaltic, Granitic, and Andestic Rock
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Balsalic Rocks
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are dark colored rocks formed from dark colored magma, high content of iron and magnesium- fine grained
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What is an example of Balsaltic rock and what elements are within
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Balsalt
magnesium and iron |
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Granitic Rocks
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light colored from high content in cilica of Si02. Granitic rocks are light colored and course grained
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Andestic Rock
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these rocks form from molten material high content of iron, magnesium, and silicates ex. Diorite Porthyistic large over backround of small
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