1. Rock Review http://www.fi.edu/fellows/fellow1/oct98/create/s ediment.htm

2. Igneous Rocks: How are they classified?  Composition: minerals that make up rock Light colored- high quartz Dark colored- low quartz Amount of silica  Texture: size of crystals

3. Igneous Rock: Rock that is formed from molten (melted) material Intrusive: rock that cools and hardens under the earth's surface  Large crystals Extrusive: rock that cools and hardens on the earth's surface  Small crystals

4. Types of Lava:  Basaltic- heavy dark colored rocks that make lava flows like those in Hawaii- thick and slower moving (Low silica)  Granitic- light colored rock that forms magma that builds up pressure- violent eruptions – Mt. St. Helens (High silica)  Andesetic- rocks with characteristics between basaltic and granitic - pacific ocean volcanoes (Medium silica)

6. Sedimentary Rock  Rock that is formed from sediments that are compacted and cemented together  Classification 1. Clastic (detrital): made of fragments of previous rock  Classified by size and shape of fragments 2. Biochemical or Organic: rock formed from once living material (fossils) 3. Chemical: formed from minerals left behind when water dries up

8. Metamorphic Rocks  Rocks that have changed due to heat and pressure  Classification: according to arrangement of grains that make up rock Foliated: bands, rock has a striped look Nonfoliated: no bands or stripes seen