Rocks A solid mixture of minerals and other materials.

Label the six pockets 1.Classifying Rocks 2.Igneous Rocks 3.Sedimentary Rocks 4.Rocks from Reefs 5.Metamorphic Rocks 6.The Rock Cycle

Rocks A solid mixture of minerals and other materials.

Classifying Rocks 1.What Characteristics do geologists use to identify rocks? Answer: Mineral composition, color and texture

Classifying Rocks 2.What are the three main groups of rocks Answer: Igneous, Sedimentary, Metamorphic

Classifying Rocks 3.How do you explain “rock forming mineral” Answer: One of about 20 minerals that make up most of the rocks in Earth’s crust

How Rocks Form Explain and sketch

Bell Questions 2/2/10 1.What characteristics do geologists use to identify rocks? 2.What are the 3 main groups of rocks?

Igneous Rocks Classified by Origin, Texture, and Composition

Origin Extrusive rock – formed from lava that erupted onto Earth’s surface (Basalt) Intrusive rock – Magma hardened beneath earth’s surface (granite)

Texture Fine-grained – Extrusive, rapidly cooling (Rhyolite) Coarse-grained – Intrusive (Granite) No grains – Obsidian or volcanic glass

Mineral composition Light-colored, intermediate-colored, dark- colored High silica is light colored Low silica is dark colored

Uses of Igneous Rocks Building materials – Granite for buildings, basalt is crushed to make gravel Pumice – cleaning and polishing Obsidian – Sharp tools