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7GrInEarthCh2Sec1&3
7th Grade Inside Earth Chapter 2 Sec 1 & 3
Question | Answer |
---|---|
stress | a force that acts on rock to change its shape or volume |
tension | stress force pulls on the crust stretching rock so that it becomes thinner in the middle |
compression | stress force squeezes rock until it folds or breaks |
shearing | stress that pushes a mass of rock in two opposite directions |
normal faults | fault is at an angle |
hanging wall | block of rock that lies above the fault |
footwall | block of rock that lies below the fault |
reverse fault | fault where the blocks move in the opposite direction |
strike-slip fault | a fault where the rocks on either side of the fault slip past each other sideways |
anticline | a fold in rock that bends upward into an arch |
syncline | a fold in rock that bends downward to form a valley |
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 |