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Rocks & Minerals
Vocabulary Practice
Question | Answer |
---|---|
fault | a crack in earth's crust |
magma | hot molten rock below earth's surface |
lava | hot molten rock that reaches earth's surface |
weathering | The breaking down of rocks into small pieces |
erosion | the picking up and carrying away of the small pieces of rock |
ore | a rock that is mined for profit |
gem | a mineral that is considered rare and beautiful |
nonrenewable resource | a material that cannot be replaced in nature within a short time |
Mohs' Scale of Hardness | a scale that classifies a minerals general hardness |
deposition | the dropping off of bits of eroded rock |
mineral | solid material in Earth's crust made by nonliving material |
luster | the appearance of a mineral, how light bounces off of it |
streak | The test used to determine a minerals true color |
hardness | how well a mineral resists scratching |
cleavage | the breaking of a mineral along a flat surface |
rock | naturally formed solid in earth's crust made up of two or more kinds of minerals |
igneous rock | formed by cooled magma underground or cooled lava above ground |
Sedimentary rock | formed by deposition, pressure and time has layers and feels grainy or sandy |
fossil | remains or imprints of living things of the past |
metamorphic rock | rocks that have changed due to pressure and heat |
humus | decayed plant/animal material |
soil horizons | layers of soil in earth, lowest is the oldest |
pollution | harmful substances in the earths soil, water, or air |
rock cycle | how rocks change from one type to another |