| A | B |
|---|
| geologist | a scientist who studies Earth |
| rock | the material that forms Earth's hard surface |
| geology | the study of planet Earth |
| constructive | forces that build up mountains and landmasses |
| destructive | forces that slowly wear away mountains and landmasses |
| continents | a large landmass on Earth |
| seismic wave | the waves produced by earthquakes |
| pressure | the force pushing on a surface or area |
| crust | the layer of rock that forms Earth's outer skin |
| basalt | dark, dense rock which makes up most of the oceanic crust |
| granite | the rock that makes up most of the continental crust |
| mantle | the layer of hot rock under the crust |
| lithosphere | a rigid sublayer which includes the crust and a thin layer of the mantle |
| asthenosphere | the soft sublayer under the lithosphere which flows slowly |
| outer core | a layer of molten metal |
| inner core | the innermost layer of Earth - made of solid metal |
