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Rocks and Minerals
Term | Definition |
---|---|
natural resources | a materials on Earth that is necessary or useful to people |
rock | a non-living material made of one or more minerals |
humus | bits of decayed plants and animals - add nutrients to soil |
soil | a mixture of minerals, weathered rocks, and other things |
sediment | tiny bits of weathered rock, shells, or sand |
igneous rock | a rock formed when magma or lava cools and hardens |
metamorphic rock | a rock is formed when other rocks change with heat and pressure |
sedimentary rock | rocks formed from layers of sediment cementing together |
Moh's scale | a scale used to tell how hard rocks or minerals are |
topsoil | the top layer of soil; the most humus |
subsoil | below the topsoil, has less humus |
loam | the best kind of soil for growing plants |
clay soil | the type of soil that holds the most water |
Properties of Minerals | color, streak, luster, hardness |
the hardest mineral on Earth | diamond |
bedrock | the bottom soil layer |
roots | hold plants in place and take in water |