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Earth Structures
4th grade standards review- minerals, rocks, weathering, erosion, renewable
Term | Definition |
---|---|
weathering | rock is broken through the force of another substance |
erosion | the action where substances such as rock and soil are moved from one location to another |
renewable resources | a resource which can be renewed or replaced easily |
non renewable resources | a resource that cannot be replaced easily |
mineral | a solid non living substance that occurs in nature |
rock | a naturally occuring substance made of two or more minerals and possibly fossils |
Igneous rock | rock that is formed when magma cools |
Sedimentary rock | rock that is formed when sand and small rocks compact and cement together |
Metamorphic rock | rock that is formed under intense heat and pressure |
Luster | the shininess of a mineral |
Hardness | how easily a mineral is scratched |
Cleavage | the pattern or angles in which a mineral breaks apart |
Color | the visible color of a mineral |
Streak | the color of the powder a mineral leaves on a ceramic tile or plate |