I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens)
I. FormationThey are
formed when hot, liquid rock, or magma,
cools and solidifies (Hardens)
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.
Igneous RocksCoarse-Grained
Fine-Grained
Granite
Gabbro Basalt
Rhyolite
III. Magma vs. Lava
Magma – molten material below the earth’s surface.
Lava – molten material above the earth’s surface.
MUST KNOW INFO
IV. 2 Types
of Igneous Rocks
A. Intrusive Igneous Rocks: Magma pushes into
surrounding rock below the Earth’s surface
Cools slower Large Crystals Think: (INSIDE)
Examples:
Did you know?!?! Granite is the most abundant intrusive
rock!
B. Extrusive Rocks: forms when
magma erupts onto the Earth’s surface (lava),
cools quickly very small or no
crystals formed Think:
(EXTERIOR)
Example:
Basalt is the most common
EXTRUSIVE igneous rock!
Did you know?!?! Another name for
an Extrusive rock is a
VOLCANICrock
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?
http://www.youtube.com/watch?v=PqgHUPSTojY
Igneous Rock Video
Must write down TWO things you learned!!!!
Be prepared to share!
http://www.youtube.com/watch?v=rkGVE6wNAzo
A little Science Rap