Cold water is denser than warm water, and so
sinks. Ice melting into the ocean cools off the
water, causing it to sink. This creates a current
by which cold water is sinking near the poles,
which pushes the water in the depths of the ocean,
driving the entire ocean to circulate. This cold,
deep water is then forced back up against the
western shores of continents where it can be
warmed up (it's always the western shores because
the Earth is rotating from west to east).
Click Here to return to the search form.