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Rocks & Soil
3-19-2012
Question | Answer |
---|---|
mineral | a naturally occurring, non-living solid with a specific chemical composition and crystal structure |
Mohs' scale | a list of minerals of varying hardness |
ore | a mineral that contains a valuable substance in it, such as silver or iron |
paleontologist | a person who studies fossils |
pebble | a small, smooth, rounded rock |
rock | a naturally occurring combination of minerals |
rock cycle | a gradual and steady change of rock in the earth's crust to igneous, sedimentary, or metamorphic rock |
sand | the rock and mineral particles smaller than two millimeters in diameter |
sediment | the pieces of material carried and deposited by water or wind |
silt | very small soil particles that can be picked up and carried by wind and water |
soil | a mixture of crushed rock and pieces of organic material from plants and animals that covers some areas of the crust |
weathering | the mechanical or chemical breaking of rock into smaller pieces that eventually decay to soil |