terms and definitions
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| Epicenter | Point on Earth's surface directly above an earthquake's focus.
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| Fault | facture that occurs when rocks break and that results in relative movement of opposing sides; can form as a result of compression.(being pulled apart)
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| Focus | Point deep inside Earth where energy is released, causing an earthquake.
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| Lava | Molten rock flowingn onto Earth's surface.
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| Lithosphere | Rigid layer of Earth about 100km thick, made up of the crust and a part of the upper mantle.
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| Magnitude | A measure of the energy released by an earthquake.
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| Rifts | Long crack, fissure, or trough that forms between tectonic plates moving apart at plate boundaries.
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| Seismic Safe | Describes the ability of the stuctures to stand up against the vibrations caused by an earthquake.
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| Surface Waves | A vibration set off by a sudden movement along a fault in Earth's surface and spread across the occean in a series of long waves.
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| Seismograph | Instument used to record seismic waves.
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| Tsunami | Powerful seismic sea wave that bagins over an ocean floor earthquake, can reach 30m in height when approaching land, and can cause destruction in coastal areas.
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| Volcanoes | Cone-shaped hill or mountain formed when hot magma,solids,and gas erupts onto Earth's surface through a vent.
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| Pyroclastic Flow | Another hazard for inhabitants of montserrat. They can occur anytime on any side of the volcano.
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| Richter Scale | Is based on measurments of amplitudes, or heights, of seismic waves as recorded on seismographs.
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| San Andreas | Fault that makes California an area of high risk for earthquakes.
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| Seismograph | An instrument used to detect and record earthquakes.
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| Subduction | The process of an oceanic plate colliding with and descending underneath a continental plate.
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| Epicenter | The area of the earth's surface that is derectly above the origi of an earthquake.
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| Mexico | This country's capital city was devastated by an earthquake in 1985.
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