Igneous RocksIgneous RocksRocks & Minerals Notes: Page 7Rocks & Minerals Notes: Page 7

How are igneous rocks formed?

Name two places where igneous Name two places where igneous rocks formrocks form

What determines crystal size?

What’s the difference between extrusive and intrusive igneous

rocks?

form on or near thesurface (small

crystals)

form below the

surface(large

crystals)

Characteristics used to classify igneous rocks

Characteristics used to classify igneous rocks

Characteristics used to classify igneous rocks

Characteristics used to classify igneous rocks

Characteristics used to classify igneous rocks

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 meltedand are now physically connected

Please Answer the Questions on Page Please Answer the Questions on Page 88

Using Your Earth Science Reference Using Your Earth Science Reference Tables.Tables.

The Answers (Page The Answers (Page 8):8):1. Basaltic 1. Basaltic GlassGlass2. Granite2. Granite3. Basalt3. Basalt