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GEO 121
Defintions of key terms about rocks, volcanoes, plate tectonics, etc.
| Question | Answer |
|---|---|
| Pangea | (plate tectonics) a hypothetical continent including all the landmass of the earth prior to the Triassic period when it split into Laurasia and Gondwanaland |
| Continental drift | the gradual movement and formation of continents (as described by plate tectonics) |
| Seafloor spreading | The outward movement of the seafloor from central underwater ridges as a result of plate tectonics; the major cause of continental drift |
| Subduction | In geology, subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate, sinking into the Earth's crust, as the plates converge. |
| Plate tectonics | is a scientific theory which describes the large scale motions of Earth's lithosphere. |
| Paleomagnetism | Paleomagnetism is the study of the record of the Earth's magnetic field preserved in various magnetic minerals through time. |
| Apparent polar wander path | A path on the globe along which a magnetic pole appears to have wandered over time; in fact, the continents drift, while the magnetic pole stays fairly fixed. |
| Abysmal planes | Abysmal plains are flat or very gently sloping areas of the deep ocean basin floor. They are among the Earth's flattest and smoothest regions and the least explored. Abyssal plains cover approximately 54% of the Earth’s surface |
| Mid ocean ridges | A mid |
| Trenches | A trench is a type of excavation or depression in the ground. Trenches are generally defined by being deeper than they are wide (as opposed to a wider gully or ditch), and by being narrow compared to their length (as opposed to a simple hole) |
| Fracture Zones – A linear feature on the deep | sea floor across which the lithosphere changes abruptly in both age and water depth. |
| Magnetic Anomaly | The difference between the expected strength of the Earth's magnetic field at a certain location and the actual measured strength of the field at that location |
| Magnetic reversals – when the Earths’ magnetic field flips from the normal to reversed polarity. (picture pg. 69) | |
| Magnetic force | The push or pull exerted by a magnet. |
| Magnetic field –field created by magnetic force around an object | |
| Magnetization | Difference in degrees from magnetic north and true north. |
| Magnetic inclination | |
| The angle between a magnetic needle free to pivot on a horizontal axis and a horizontal plane parallel to the Earth's surface. |
Created by:
oliviashley
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