Question

1. what are tides?

a. waves caused by wind
b. ocean currents that move water sideways
c. the regular rise and fall of ocean water levels
d. storms that happen near the coast

Explanation:

Tides are defined as the regular rise and fall of ocean water levels, mainly caused by the gravitational pull of the moon and the sun. Option A describes wind - generated waves, option B is about ocean currents (which are different from tides), and option D refers to coastal storms, none of which are tides.

Answer:

C. The regular rise and fall of ocean water levels