6th grade Science Chapter 2 book 2
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Created by:
captaint10 on October 25, 2010
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29 terms
Terms | Definitions |
|---|---|
 earthquake | The shaking that results from the movement of rock beneath the earths surface |
| fault-block mountain | as tension forces pull the crust apart |
| plateau | a large area of flat land elevated high above the level |
| syncline | a downward fold in rock formed by compression in the earth's crust |
| anticline | a upward fold in the rock formed by compression in the earth's crust |
| strike-slip fault | a type of fault in which rocks on either side move past each other sideways with little up or down motion |
| foot wall | the block of rock that forms the lower half of the fault |
| hanging wall | the block of rock that forms the upper half of a fault |
| normal fault | a type of fault where the hanging wall slides downward caused by tension in the crust |
| shearing | stress that pushes masses of rock in opposite directions in a sideways movement |
| compression | stress that squeezes from until in folds or breaks. |
| tension | stress that stretches rock so that it becomes thinner in the middle |
| stress | a force that acts on rock to change it's shape or volume |
| focus | the point beneath earth's surface where rock breaks under stress and causes an earthquake |
| epic center | the point of earth's surface directly above the earthquake's focus |
| p wave | a type of seismic wave that compresses and expands the ground |
| s wave | a type of seismic wave that moves the ground up and down or side to side |
| surface wave | a type of seismic wave that forms when p waves and s waves reach the earth's surface |
| mercalli scale | a scale that rates earthquakes according their intensity and how much damage they cause at a particular place. |
| magnitude | the measurement of an earthquake's strength based on seismic waves and movement along faults. |
| richter scale | a scale that rates an earthquakes magnitude based on the size of its seismic waves |
| seismograph | a device that records ground movements caused by seismic waves as they move through earth. |
| moment magnitude scale | a scale that rates earthquakes by estimating the total energy released by an earthquake |
| seismogram | the record of an earthquake's seismic waves produced by a seismograph |
| friction | the force that opposes the motion of one surface as it moves across another surface |
| liquefaction | the process by which an earthquake's violent movement suddenly turns loose soil into liquid mud |
| afterschock | an earthquake that occurs after a larger earthquake in the same area |
| tsunami | a large wave produced by an earthquake on the ocean floor |
| base-isolated building | a building mounted on bearings designed to absorb the energy of an earthquake |
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