click below
click below
Normal Size Small Size show me how
Geology
Question | Answer |
---|---|
Pangaea | "All Earth" super continent. Existed 250 million years ago. |
Plate Tectonics | Theory that the Earth's crust is broken into parts. |
Plate | Rigid block of Earth's crust. |
Continental Drift | Continents plowing through the seafloor to their present day position. |
Earthquake | A shaking or trembling of the Earth. |
Convergent boundary | Two tectonic plates that push directly into one another. (form mountains) |
Divergent boundary | The boundary between two tectonic plates that move away from each other. (form valleys) |
Transform fault boundary | The boundary between two tectonic plates that slide past each other. (earthquakes) |
Magnetometer | Instrument that detects magnetic changes in crustal rocks. |
Fault | A break in the Earth's crust, in which blocks of the crust slide next to one another due to tectonic forces. |
Mid Ocean Ridge | A long mountain chain that forms on the ocean floor where tectonic plates pull apart. The youngest rocks on earth are found here. |
Seismograph | Instrument used to record the force and timing of an earthquake |
Seismogram | Paper print out from the seismograph showing arrival times of earthquake waves. |
Volcano | A mountain that forms when molten rock rises to the earth's surface |
Magma | Hot liquid that forms when rocks melt under the earth's surface. |
Lava | Magma that flows on the earth's surface. |
Epicenter | Location on Earth's surface directly above the earthquake. |
Focus | Location within the Earth where the earthquake occurred. |