it is estimated thet 7×10⁶ kg of wazer pours over the niagera falls every second. if the falls are 50 meter high, and if all the energy of falling water could be harnessed, what power would be available?(g=10 N/kg)

wavelength divides in half and speed stays the same.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.