| A | B |
|---|
| geologist | a scientist who studies the forces that make and shape planet Earth. |
| geology | the study of the solid Earth. |
| outer core | a layer of molten iron and nickel that surrounds the inner core of Earth. |
| inner core | a dense sphere of solid iron and nickel in the center of Earth. |
| crust | the layer of rock that forms Earth's outer surface. |
| 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. One of four spheres into which scientists divide Earth. |
| asthenosphere | the soft layer of the mantle on which the lithosphere floats. |
| pressure | force exerted on a surface divided by the total area over which the force is exerted; also the force of a gas's outward push divided by the area of the walls of the container. |
| rock | the material that forms Earth's hard surface. |
| granite | A usually light-colored rock that is found in continental crust. |
| basalt | a dark, dense, igneous rock with a fine texture, found in oceanic crust. |
| density | the measurement of how much mass of substance is contained in a given volume. |
