Download Rocks

Rocks
A solid mixture of minerals and other materials.
Label the six pockets
1.
2.
3.
4.
5.
6.
Classifying Rocks
Igneous Rocks
Sedimentary Rocks
Rocks from Reefs
Metamorphic Rocks
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, darkcolored
• 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