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

Vocabulary

• 30) Igneous Rock: Rocks formed by the solidification of magma

• 31) Solidification: when some becomes as solid from a liquid

• 32) Magma: Molten (melted rock) • 33) Intrusive rocks: Rocks which form inside a volcano • 34) Extrusive: Rocks which form outside of the volcano. • 35) Texture: How something feels • 36) Course: Large crystals causing a rough texture• 37) Fine: Small crystals causing smooth texture. • 38) Mafic: Igneous rocks which contain Fe and Mg• 39) Felsic: Igneous rocks which contain Al

How are igneous rocks formed?

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

How is crystal size determined?

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 8Please Answer the Questions on Page 8Using 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