I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens)
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Transcript of I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens)
III. Magma vs. Lava
Magma – molten material below the earth’s surface.
Lava – molten material above the earth’s surface.
MUST KNOW INFO
A. Intrusive Igneous Rocks: Magma pushes into
surrounding rock below the Earth’s surface
Cools slower Large Crystals Think: (INSIDE)
B. Extrusive Rocks: forms when
magma erupts onto the Earth’s surface (lava),
cools quickly very small or no
crystals formed Think:
(EXTERIOR)
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