| RichterScale | | type of rock formed by the slow accumulation of small fragments of rock |
| Extrusive | | vibrations spreading out from the earthquakes focus |
| Fossils | | a type of rock formed below the Earth’s surface when a rock is altered |
| Mould | | shell of rock around the surface |
| PrincipalofSuperposition | | hot molten rock found at great depths below the Earth’s surface |
| Beds | | people who study the Earth |
| Focus | | rock formed from magma that cooled and hardened below the surface |
| magma | | horizontal layers of rock caused by the slow accumulation of sediments |
| Mineral | | combination of two or more minerals in various protection |
| Crust | | Pure substance that cannot be broken down into other substances |
| Igneous | | the remains and traces of prehistoric organisms |
| Petrifiedfossil | | a rock that looks exactly like the original shell, bone or piece of wood |
| Epicenter | | rock formed by lava that cooling on the surface of the earth |
| Fold | | measures the magnitude of an earthquke |
| Intrusive | | Ten minerals ranked in order of hardness against when all minerals are compared |
| Seismograph | | type of fossil made when sediment slowly fills a mould |
| Mantle | | type of rock formed by the cooling of molten rock |
| Fault | | the break in the Earth’s crust along which rock moves |
| Metamorphic | | a visual record of earthquake vibrations |
| Sedimentary | | - an instrument for measuring earthquake vibrations |
| Vent | | the point underground where the energy is first released to cause an earthquake |
| SeismicWaves | | a cavity made by the imprint of an organism or its tracks |
| Rock | | An exact date that can be given in years |
| Relative Age | | The age of someone or something compared with the age of someone or something else |
| Seismogram | | bending and tilting of sedimentary rock layers |
| Element | | hot molten rock that flows onto the Earth’s surface |
| MOH’sHardnessScale | | A general rule that determines the relative age of sedimentary rock |
| Geologists | | the thickest layer of the Earth |
| Absolute Age | | - the opening in a volcano where the lava flows through |
| lava | | pure, naturally occurring solid material made up of a combination of 2 or more elements |
| Cast | | the point on the Earth’s surface above the focus, from which earthquakes originates |
