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Rocks
5th grade
Term | Definition |
---|---|
4.6 billion years old | the approximate age of Earth |
sedimentary rock | rock formed by layers of sediment cemented together |
igneous rock | rock formed from melted/cooled lava and magma |
metamorphic rock | rock changed by heat and pressure |
fossils | provide information and conditions of the past |
crust, mantle, outer core, and inner core | the four layers of Earth |
convergent boundaries | tectonic plates that move together |
divergent boundaries | tectonic plates that move apart |
transform boundaries (strike-slip or sliding boundaries) | tectonic plates that slip past each other horizontally |
weathering | the breaking down of rocks |
erosion | the movement of sediments by water and wind |
deposition | sediments being deposited in new locations |
sediments | broken down pieces of rock |