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chapter 9 vocab
5 ATHENA ch 9 Scott Foresman 2008
vocabulary word | definition |
---|---|
crust | the outermost and thinnest layer of Earth's layers |
mantle | the layer of Earth between the crust and core |
core | the center part of Earth which includes the liquid outer core and solid inner core |
plate | a large section of Earth's crust and upper mantle |
mechanical weathering | the breaking down of rocks into smaller pieces by any physical force such as gravity, water, wind, ice, or living organisms |
chemical weathering | changing of materials in a rock by chemical processes |
igneous rock | type of rock formed when lava or magma cools and hardens |
sedimentary rock | type of rock formed when sediments are pressed and cemented together |
metamophic rock | a type of rock formed when existing rock is heated at high pressures and temperatures |