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Our Changing Earth
Weathering and Erosion, Plate Movements, interior, and rocks
| Term | Definition |
|---|---|
| weathering | the process by which rock is broken down into smaller pieces |
| gravity | this can cause rocks to fall down a hill |
| deposition | the dropping of weathered rock by wind or moving water |
| sediment | very small pieces of rock;examples include sand and silt |
| erosion | removal of soil and rock from the Earth's surface |
| Grand Canyon | formed by the moving water of the Colorado River |
| crust | Earth's rocky outer layer |
| mantle | layer below the Earth's crust |
| outer core | made of molten, liquid metal |
| inner core | made of solid iron and nickel |
| crust | thinnest under oceans and thickest under mountains |
| mantle | contains some liquid rock, but mostly solid rock |
| outer core | source of Earth's magnetic field is Iron from this core |
| inner core | Earth's hottest layer |
| crust | least dense and thinnest layer |
| mantle | most dense and thickest layer |
| crust | hard and made of many minerals |
| mantle | makes up about 2/3 of Earth's mass |
| convergent | when two plates collide or travel toward each other |
| divergent | when two plates move away from each other |
| transform | when two plates slide past each other |
| convergent | this type of boundary forms volcanoes and mountains |
| divergent | this type of boundary forms ridges and rift valleys |
| transform | this type of boundary causes earthquakes |
| sedimentary rocks | formed by compaction and cementation of sediments |
| sediments | small pieces of rock; examples include sand and silt |
| igneous rocks | rocks formed near volcanoes by melting and cooling |
| metamorphic rocks | rocks formed by heat and pressure |