Tides are the periodic rise and fall of the sea caused by the gravitational pull of the moon and sun on the earth's oceans.
(Tides; are; the periodic rise and fall of the sea) (the sea; caused; by the gravitational pull of the moon and sun on the earth's oceans)
Tides the sea
are caused
the periodic rise and fall of the sea
by the gravitational pull of the moon and sun on the earth's oceans