2What is anearthquake?What causesearthquakes?Earthquake: The shaking and trembling that comes from the movement of rock beneath Earth’s surface.When the tectonic plates of Earth’s lithosphere move they cause stress on the crust.
4The more energy built up, the bigger the quake. What isstress?How does itCreateearthquakes?Stress: A force that acts on rock to change its shape or volume. Stress adds energy to the rock.Stress builds up until there is enough energy to overcome the friction, and the land shifts.The more energy built up, the bigger the quake.
5What is FrictionFriction is the force that opposes the motion of one surface as it moves across another surface. Friction exists because surfaces are not perfectly smooth.Rocks move along a fault depending on how much friction there is between opposite sides of the fault.How_Does_Plate_Movement_Generate_Earthquakes
6Are there different types of stress? What are they? Three Types of StressShearing , Tension and CompressionShearingPushes a mass of rock in two opposite directions. Rock breaks, slips apart or changes its shape.Are there different types of stress? What are they?
7TensionPulls on the crust, stretching rock so that it becomes thinner in the middle. It occurs where two plates are moving apart.
8Stress videoCompressionSqueezes rock until it breaks. One plate pushing on another compresses rock like a trash compactor.
9What are faults? Where do they occur? Fault: A break in Earth’s crust where slabs of crust slip past each other. Faults occur when enough stress builds up in rock to make it break.
11Describe and draw the three types of Faults. 1) Strike Slip FaultsFound at transform boundariesThe rocks on either side of the fault slip past each other sideways with little up or down motionEx: San Andreas Fault.
14What is the difference between a hanging wall and a footwall? normal fault animationNormal FaultsFound at divergent boundaries.Tension forces in Earth’s crust cause normal faults. The fault is at an angle, so one block of rock lies above the fault while the other block lies below the fault. There is up and down motion.Hanging Wall lies aboveFootwall lies below