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what are some similarity between convection currents in the mantle and in the ocean? what are the differences?

They are similar because in both, the hot air rises while the cool air drops. Convection currents in the mantle is what contributes to the movement plate tectonics. 

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy