I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens)

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I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens)

Transcript of 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. Classification

Igneous rocks are classified according to their composition and texture.

4 basic types of texturesFine-GrainedCoarse-

Grained

Glassy Porphyritic

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!