What magnitude must an earthquake reach to generate a dangerous tsunami?
8.0+
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10
What slows a tsunami down?
When it reaches shallow water.
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15
What is the connection between earthquakes and tsunamis?
If big enough and close enough to the ocean floor, the energy from such an earthquake can cause the ocean floor to suddenly rise (uplift) or fall (subside).
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What determines the speed of a tsunami?
Ocean depth rather than the distance from the source of the wave.