Igneous Rocks Chap. 5 What are igneous rocks? Identifying igneous rocks.
Igneous rocks
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Transcript of Igneous rocks
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I. FormationThey are
formed when hot, liquid rock, or magma,
cools and solidifies (Hardens)
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II. ClassificationIgneous rocks are classified
according to their composition and texture.
4 basic types of texturesGlassy – black and sharpFine grained – interlocking piecesCoarse grained – consist of
interlocking mineral crystalsPorphyritic – made of large crystals
scattered on the back of small crystals.
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Igneous RocksCoarse-Grained
Fine-Grained
Granite
Gabbro Basalt
Rhyolite
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III. Magma vs. Lava
Magma – molten material below the earth’s surface.
Lava – molten material above the earth’s surface.
MUST KNOW INFO
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IV. 2 Types
of Igneous Rocks
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A. Intrusive Igneous Rocks: Magma pushes into
surrounding rock below the Earth’s surface
Cools slower Large Crystals Think: (INSIDE)
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Examples:
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Did you know?!?! Granite is the most abundant intrusive
rock!
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B. Extrusive Rocks: forms when
magma erupts onto the Earth’s surface (lava),
cools quickly very small or no
crystals formed Think:
(EXTERIOR)
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Example:
Basalt is the most common
EXTRUSIVE igneous rock!
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Did you know?!?! Another name for
an Extrusive rock is a
VOLCANICrock
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A Closer Look at an Igneous Rock
Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material. It cools so rapidly that crystals do not form.
Is it fine-grained or coarse-grained?
Is this rock Intrusive or Extrusive?
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http://www.youtube.com/watch?v=PqgHUPSTojY
Igneous Rock Video
Must write down TWO things you learned!!!!
Be prepared to share!
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http://www.youtube.com/watch?v=rkGVE6wNAzo
A little Science Rap