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Description
Flashcards by Edis Saric, updated more than 1 year ago
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Created by Edis Saric
over 7 years ago
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| Question | Answer |
| what is an earthquake? | the rapid movement of the ground usually back and forth, up and down in a wave motion due to the movement of the tectonic plates |
| what is a epicentre? | the point on the earths surface directly above the focus of an earthquake |
| what is focus? | the place blow the ground where an earthquake starts |
| what are hotspots? | isolated places away from plate boundaries where a lot of hot magma is being created |
| what is lava? | molten rock below the earths surface |
| what are primary waves? (P-waves) | a longitudinal seismic wave that travels fast trough the earth |
| what is pyroclastic flow? | a cloud of ash, rock and gas at about 500'C that exits the volcano like an avalanche |
| what is secondary waves? (S-waves) | a transverse seismic wave that travels through the earth |
| what is seismic waves? | the shaking, wave-like movement of the ground In the earthquake |
| what is a seismometer? | an instrument that detects the seismic waves from an earthquake |
| what is a surface wave? | a seismic wave that travels along the surface of the earth in the crust |
| what is a tsunami? | a huge wave in the ocean caused by an earthquake occurring on the seafloor |
| what is an volcano? | a place where extremely hot material form inside the earth erupts at the surface |
| what are the types of volcano eruptions? | gas,ash,lave and solid volcanic rock |
| what colour dose the lava change? | white,yellow,orange,red and finally black |
| where do volcanos form? | near the edges of the tectonic plates |
| what causes an earthquake? | rapid release of an energy as the tectonic plates move |
| what is used to detect earthquakes? | a seismometer |
| what are the 3 types of waves? | primary waves(P-WAVES) secondary waves(S-WAVES) surface waves |
| where do earthquakes occur? | at the start of the tectonic plates and stronger ones near collision (converging boundaries) |
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