2-Earth-Rocks

Big Idea

 * Types of Rocks**

Key Terms

 * IGNEOUS ROCK: rock that crystallizes from magma, or molten rock, deep inside the earth, or is spewed up as lava during volcanic eruptions. Some examples are granite and basalt.

SEDIMENTARY ROCK: rock formed from tiny grains of smashed-up and ground-up rock or from broken and ground up shells, usually floating in water. These grains settled to the bottom and built up in layers that hardened into solid rock. Some examples are shale and limestone.

METAMORPHIC ROCK: rock that forms when igneous or sedimentary rock is crushed and heated by movements in the Earth. One example is marble.**

Materials/ Resources Teachers
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Content/ Skills
1. What colors are the rocks? Group them according to color. 2. Do the rocks have different textures and surfaces, i.e. rough, smooth, shiny, dull? Group them according to texture. 3. Lift each rock. Are they all the same density? Group rocks according to density. 4.Are there any other characteristics that you see? Then, group rocks according to other characteristics that you identify. 5. Identify each rock using the books, computers, and other resources, and write a description of the rock on an index card. Descriptions should include: what type of rock it is; how the rock was formed; where the rock is found; and what information the rock can provide about the history of the Earth.**
 * Have students, working in small groups, complete the following activity.