| A | B |
|---|
| geologist | A scientist who studies the forces that make and shape planet Earth. |
| inner core | A dense sphere of solid iron and nickel in the center of Earth. |
| geology | The study of planet Earth. |
| constructive force | A force that builds up mountains and landmasses on Earth's surface. |
| destructive force | A force that slowly wears away mountains and other features on the surface of Earth. |
| continent | A great landmass surrounded by oceans. |
| seismic wave | A vibration that travels through Earth carrying the energy released during an Earthquake. |
| pressure | The amount of force pushing on a surface or area. |
| crust | The layer of rock that forms Earth's outer surface. |
| basalt | A dark, dense, igneous rock with a fine texture, found in oceanic crust. |
| granite | A usually light-colored rock that is found in continental crust. |
| mantle | The layer of hot, solid material between Earth's crust and core. |
| lithosphere | A rigid layer made up of the uppermost part of the mantle and the crust. |
| asthenosphere | The soft layer of the mantle on which the lithosphere floats. |
| outer core | A layer of molten iron and nickel that surrounds the inner core of Earth. |
| rock | The material that forms Earth's hard surface. |
