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| Core | The centre of the earth |
| Crust | The thin layer at the earth's surface |
| Mantle | The molten layer surrounding the earth's core |
| Conservative Boundary (Transform Fault) | Where two plates move parallel (side by side) to each other |
| Collision Boundary | Where two continental plates are moving together |
| Destructive (convergent) Boundary | Where an oceanic and continental plate are moving together |
| Constructive (divergent) Boundary | Where two plates are moving away from each other |
| Plate Margins | The place where two plates meet |
| Subduction zone | The point at whihc one plate is dragged under another |
| Tectonic Plates | Large slabs of the earths crust which move across the globe on top of the mantle below |
| An earthquake | A sudden movement within the earth's crust |
| Epicentre | Point on the earth's surface directly above an earthquakes focus |
| The Focus | The point where an earthquake starts underground |
| Liquefaction | Where the ground turns to a liquid state as water is shaken up from below |
| Primary effects | The direct effects of an earthquake e.g. building collapsing |
| Secondary effects | The indirect effects of an earthqukae - e.g. fire caused by broken gas main |
| Seismograph | A graph measuring and recording the intensity of an earhtquake |
| Magnitude | The amount of energy released by an earthquake |
| Richter Scale | The scale used to measure the magnitude of an earthquake |
| Pyroclastic flow | A dense burning avalanche of hot gases, volcanic fragments and ash |
| Lava | Molten rock on the earth's surface |
| Magma | Molten rock under the earth's surface |
| Volcano | An opening at the earth's curst through which lava and ash may be ejected |