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Lesson 2 Power Point
Igneous Rocks
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Igneous rocks are formed from
magma (Arizona, 2007). “The two
main types of igneous rocks are
plutonic and volcanic.
Plutonic rocks are formed when
magma cools and solidifies
underground.
Volcanic Rocks
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“Volcanic rocks are formed from lava
that flows on the surface of the Earth
and other planets and then cools and
solidifies” (Arizona, 2007, p. 1)
It is important to look at texture of
rocks.
All rocks have different
characteristics
Crystals
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When magma cools, the rocks form
crystals.
Could be large or small
Igneous Rocks
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There are many different
compositions of igneous rocks.
Could be dark-high in Iron
Could be light- felsic rocks
Sedimentary Rocks
2 types of Sedimentary Rocks
 Clastic or chemical
 Clastic-glued together by other rocks
Example:Sandstone
 Chemical- what is left over after
being in dissolved water
Example:Halite
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Sedimentary Rocks:
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One other class that could be
considered would be rocks made
from plants such as coal.
Metamorphic Rocks
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Form when under a lot of pressure or
high temperature (Arizona, 2007).
Examples: diamond and granite
Diamonds for under really high
pressure
What happened in order for this rock
to come so close to the Earth’s
surface?