Define hydropower or hydroelectric power ?
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What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.

The softest and hardest minerals are: softest hardest