Igneous Rocks Rocks & Minerals Notes: Page 7. How are igneous rocks formed?

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Presentation transcript:

Igneous Rocks Rocks & Minerals Notes: Page 7

How are igneous rocks formed?

Name two places where igneous rocks form

What determines crystal size?

What’s the difference between extrusive and intrusive igneous rocks?

form on or near the surface (small crystals) form below the surface (large crystals)

Characteristics used to classify igneous rocks

contains Fe and Mg contains Al

Key Identifying Features of Igneous Rocks

usually black in color the grains have been melted and are now physically connected

Please Answer the Questions on Page 8 Using Your Earth Science Reference Tables.

The Answers (Page 8): 1. Basaltic Glass 2. Granite 3. Basalt

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