Terms : Hide Images
| 12463281976 | Core | In reference to Earth, the innermost layer. | 0 | |
| 12463281977 | Mantle | The layer of Earth above the core, containing magma. | 1 | |
| 12463281978 | Magma | Molten rock. | 2 | |
| 12463281979 | Asthenosphere | The layer of Earth located in the outer part of the mantle, composed of semi-molten rock. | 3 | |
| 12463281980 | Lithosphere | The outermost layer of Earth, including the mantle and crust. | 4 | |
| 12463281981 | Crust | In geology, the chemically distinct outermost layer of the lithosphere. | 5 | |
| 12463281982 | Hot spots | In geology, a place where molten material from Earth's mantle reaches the lithosphere. | 6 | |
| 12463281983 | Plate tectonics | The theory that the lithosphere of Earth is divided into plates, most of which are in constant motion. | 7 | |
| 12463281984 | Tectonic cycle | The cycle of processes that build up and break down the lithosphere. | 8 | |
| 12463281985 | Subduction | The process of one crustal plate passing under another. | 9 | |
| 12463281986 | Volcano | A vent in the surface of Earth that emits ash, gases, or molten lava. | 10 | |
| 12463281987 | Divergent boundary | An area beneath the ocean where tectonic plates move away from each other. | 11 | |
| 12463281988 | Convergent boundary | An area where plates move toward one another and collide. | 12 | |
| 12463281989 | Transform boundary | An area where tectonic plates move sideways past each other. | 13 | |
| 12463281990 | Fault | A fracture in rock caused by a movement of Earth's crust. | 14 | |
| 12463281991 | Seismic activity | The frequency and intensity of earthquakes experienced over time. | 15 | |
| 12463281992 | Fault zone | A large expanse of rock where a fault has occurred. | 16 | |
| 12463281993 | Earthquake | The sudden movement of Earth's crust caused by a release of potential energy along a geologic fault and usually causing a vibration or trembling at Earth's surface. | 17 | |
| 12463281994 | Epicenter | The exact point on the surface of Earth directly above the location where rock ruptures during an earthquake. | 18 | |
| 12463281995 | Richter scale | A scale that measures the largest ground movement that occurs during an earthquake. | 19 | |
| 12463281996 | Igneous rock | Rock formed directly from magma. | 20 | |
| 12463281997 | Intrusive igneous rock | Rock that forms when magma rises up and cools in a place underground. | 21 | |
| 12463281998 | Extrusive igneous rock | Rock that forms when magma cools above the surface of the earth. | 22 | |
| 12463281999 | Fracture | In geology, a crack that occurs in rock as it cools. | 23 | |
| 12463282000 | Sedimentary rock | Rock that forms when sediments such as muds, sands, or gravels are compressed by overlying sediments. | 24 | |
| 12463282001 | Metamorphic rock | Rock that forms when sedimentary rock, igneous rock, or other metamorphic rock is subjected to high temperature and pressure. | 25 |
