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Rockin’ Geology Vocabulary Erosion The wearing away of soil and/or rock by wind, water, temperature change, or gravity Fossil The remains or evidence of past life usually found in sedimentary rocks Geologist A scientist who studies geology. Geology The study of the earth including its structure, rocks, and minerals. Hardness A measure of how easily a mineral can be scratched. Igneous rock Rocks formed by the cooling of molten rock at or below the surface. Luster The way the surface of a mineral looks when it reflects light. Magma Melted rock material that forms deep within Earth. Magnetism A magnet’s property of attracting certain materials, mainly iron and steel. Metamorphic RockRocks formed when existing rocks are changed by heat, pressure, or chemical reactions. Mineral A naturally occurring, non-living solid that has a definite chemical composition. Rock A solid material that is made up of one or more minerals and that may be used for its properties. Sedimentary Rock Rocks formed by particles of other rocks or the remains of plants and animals pressed and cemented together. Streak The colored powder made by rubbing a mineral against a ceramic surface. www.insidetheoutdoors.org