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12 Cards in this Set

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  • Back
within the earth's surface there is enough pressure and heat to cause rocks to melt and form magma.
How far down is the deepest magma can be found
150 km
What are the ranges in the temperature of magma
650-1200 degrees celcius
Why does magma float to the surface
its less dense then solid rock
igneous rocks that are formed within the earth as magma cools slowly- course grained
rocks that form on the earth's surface
fine grained
Volcanic glass
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
What are the three different molten rocks from which igneous rocks form.
Balsaltic, Granitic, and Andestic Rock
Balsalic Rocks
are dark colored rocks formed from dark colored magma, high content of iron and magnesium- fine grained
What is an example of Balsaltic rock and what elements are within
magnesium and iron
Granitic Rocks
light colored from high content in cilica of Si02. Granitic rocks are light colored and course grained
Andestic Rock
these rocks form from molten material high content of iron, magnesium, and silicates ex. Diorite Porthyistic large over backround of small