Campo Elementary School Mr. Bordelon, M.S. Rock Identification

Rock Types Igneous – Fired Igneous – Fired Sedimentary – Layered Sedimentary – Layered Metamorphic - Changed Metamorphic - Changed

Igneous These rocks are formed when molten magma from deep within the earth’s crust and upper mantle cools and solidifies (hardens). There are two types: 1. Intrusive – form inside earth’s crust. 1. Intrusive – form inside earth’s crust. 2. Extrusive – form on earth’s surface. 2. Extrusive – form on earth’s surface.

Igneous Examples Granite Obsidian Basalt

Sedimentary When rocks are weathered and eroded they break down into smaller pieces of rock and minerals. This material, which is called sediment, may eventually be carried to a new site, often in the sea or in river beds. The sediments are deposited in layers and compacted. In time the particles are cemented together to form sedimentary rocks.

Sedimentary Examples Limestone Sandstone Clay

Metamorphic These rocks get their name from the Greek words “meta” and “morphe,” meaning “change of form.” Metamorphic rocks are igneous or sedimentary rocks that have been altered by heat, pressure, or both.

Metamorphic Examples Marble Schists Gneiss

HOMEWORK Collect a small rock and bring it in tomorrow. Write a paragraph describing your rock. Then, make a guess at it…. Is it Igneous, Metamorphic, Sedimentary? In our next lesson, we will learn how scientists identify rocks and minerals.