The primary difference between a tide and a current is that the term tide refers to the rise and fall of the water levels, caused by the gravitational pull of the moon and sun, whereas the current refers to...

There is no actual universally standardized technical distinction between the lakes and ponds. Many scientists classify them just on the basis on size.

Dolphins and Porpoises are both mammals that differ in terms of body shape, shape of dorsal fin, teeth, behavior, traveling pattern, speech and lifespan.