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Plate Tectonics
Plate Tectonics Vocabulary
| Question | Answer |
|---|---|
| convection | circulation of material caused by a difference in temperature and density |
| convergent plate boundary | forms where two plate collide |
| divergent plate boundary | forms where two tectonic plates seperate |
| lithosphere | the cold and rigid outermost layer of Earth |
| asthenosphere | the hot upper most part of the mantle, malleable like plastic |
| plate tectonics | the theory that states the Earth's surface is made of rigid slabs of rocks, or plates, that move with respect to eachother |
| ridge push | when the rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge with force |
| slab pull | when the slab sinks and pulls on the rest of the plate with force |
| subduction | the process by which the denser plate sinks below the more buoyant plate when two plates collide |
| transform plate boundary | forms where two tectonic plates slide past each other |
| Pangaea | means all land, name given to the super continent |
| continental drift | Theory that at one time all land was connected but has since drifted apart |
| fossil | the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock |
| Alfred Wegner | German scientist who developed the theory of continental drift |
| mid-ocean ridge | a large underwater mountain chain |
| seafloor spreading | the formation of new oceanic crust, which occurs when magma at mid ocean ridges and its subsequent outward movement on either side |
| normal polarity | Normal polarity is where the magnetic north points towards the geographic north pole |
| magnetic reversal | a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged, |
| reversed polarity | a change of the earth's magnetic field to the opposite polarity. |
| Henery Hess | A geologist who explained the theory of plate tectonics using the information of seaflloor spreading |
| basal drag | convection currents drag the plates along as though on a conveyor belt |
| echo-sounder | a device used to measure the depth of the ocean |
| convection currents | The transfer heat from one place to another by mass motion of a fluid such as water, air or molten rock |
Created by:
hallet
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