Bell Work: 10/13/11  Work on Rock Cycle Paper Plate.  If you are finished with paper plate, do the section Review questions pg deposition compaction & cementation solidification deposition

Objectives Identify the major processes that drive the rock cycle. How are igneous rocks formed? How would the texture of igneous rocks change if the rock cooled quickly vs. slowly? What is the difference between intrusive igneous rocks and extrusive igneous rocks? Label a diagram that depicts the three different rock types.

Igneous Rocks: From Fire! Igneous rocks get their name from the Latin word for fire “igneus”. The name is appropriate because these rocks are born of fire.

Igneous Rock Discuss with your group: –Where do igneous rocks come from? ___________ _________ forms when hot, liquid rock, or __________, cools and solidifies. The type of igneous rock that forms depends on the composition of the magma and the amount of time it takes the magma to cool. Igneous rock magma

Igneous Rock The longer it takes for magma or lava to cool, the more time mineral crystals have to grow. –_–__________ = _____________ = ____________ Examples of coarse-grained igneous rocks: –G–Granite –G–Gabbro more time larger crystalscoarse texture

The less time magma takes to cool, the less time crystals have to grow. –_–__________ = _____________ = ____________ Examples of fine-grained igneous rocks: –O–Obsidian –B–Basalt less time smaller crystalsfine-grained

Group Activity Rank the rock samples by how fast they cooled. Pay careful attention to the grain size of each rock. Write the names of the rocks in order from fastest cooling to slowest cooling.

Igneous Rock Formations Rock formed from the cooling and solidification of magma beneath the Earth’s surface is called ____________ ___________ _________. Rock that forms from magma that erupts, or extrudes, onto the Earth’s surface is called ____________ ___________ _________. Igneous rock Intrusive ExtrusiveIgneous rock