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chapter 4 nd studies
6th grade social studies
| Question | Answer |
|---|---|
| partly melted part of the mantle that bends when heated | asthenosphere |
| How many tectonic plates does Earth have? | 15 |
| Where do plates move? | boundaries |
| Plates move away | divergent |
| Plates move toward | convergent |
| one plate slips underneath | subduction |
| plates slide past each other | transform |
| circulation of earth's fluids | convection |
| causes plate movement | convection |
| vibration of Earth | earthquake |
| caused by rupture or movement of rocks below the surface | earthquake |
| cause mountains and valleys | earthquake |
| form at convergent plate boundaries | volcanoes |
| forms at divergent plate boundaries | new ocean crust |
| process of breaking down rock but it does nothing else to the rock | physical weathering |
| process of changing the composition of the rock--like acid burning the rock | chemical weathering |