| A | B |
|---|
| Core | The innermost layer of Earth, which consists of a molten outer part and a solid inner part |
| Crust | The outer layer of the Earth. |
| Mineral | A solid element or compound found in nature and having a definite chemical composition and crystal structure. |
| Volcano | Any opening in the Earth’s crust through which hot gases, rocks, and melted material erupt. |
| Earthquake | Shaking or trembling of a portion of the earth caused by movement of rock masses or by volcanic shocks. |
| Fossil | The remains of traces of a living thing from the past that has been preserved in rock. |
| Erosion | The wearing away and removing of rock and soil caused by such forces as wind and flowing water. |
| Igneous rock | A type of rock that forms from melted rock that cools and hardens. The hot, melted rock is also known as magma. |
| Geology | The study of the Earth and its processes. |
| Mantle | A thick layer of rock between the crust and core of the Earth. |
| Metamorphic rock | A type of rock that forms from existing rocks because of changes caused by heat, pressure or chemicals. |
| Plate tectonics | The movement of the plates that make up the surface of the Earth |
| Rock cycle | The continuous series of changes that rocks undergo (weathering, melting, cooling, or pressure) |
| Sedimentary rock | A type of rock that forms when sediments harden. |
| Weathering | The breaking up of rocks into sediments by such forces as wind, rain, and sunlight. |
