1
Landslides not only are dangerous — causing on average more than 25 deaths and over ¤1 billion in damages a year — but are also widespread, occurring in all 50 states. Compounding the hazards, these natural disasters often occur along with other similar natural phenomena, such as floods...
Grade Level   5 6 7 8
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2
A normal fault occurs when rocks break and move because they are being pulled apart. As the area is stretched, the rocks move along the fault. Each movement causes an earthquake. This model demonstrates how a block of rock is extended by a normal fault. 
Grade Level   4 5 6 7 8 9 10 11 12
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3
Elastic waves that move through the Earth are called seismic waves. Want to study them more closely? SeisMac is a free application that displays the output from the Sudden Motion Sensor in recent Mac laptops as a real-time, three-axis, acceleration graph, or, more commonly, a seismogram. Once your...
Grade Level   6 7 8 9
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4
One of the most frightening and destructive phenomena of nature is a severe earthquake and its terrible aftereffects. An earthquake is a sudden movement of the Earth, caused by the abrupt release of strain that has accumulated over a long time. For hundreds of millions of years, the forces of plate...
Grade Level   7 8 9 10 11 12
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