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7GrInEarthCh2Sec1&3

7th Grade Inside Earth Chapter 2 Sec 1 & 3

QuestionAnswer
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
Created by: Karen Copanic on 2010-04-28



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