The winds cause water on the surface of the ocean to move and form waves against the surface of rocks or beaches. Stronger winds cause larger waves.

external image lajolla_5_bg_120802.jpg external image lowestoft_wave_460x300.jpg external image foamy-waves.jpg external image Big-waves.jpg

Tides are caused by the gravitational interaction between the Earth and the Moon. The gravitational attraction of the moon causes the oceans to follow the direction of the moon. The water follows the moon on the opposite side, since the Earth is also being pulled toward the moon (and away from the water on the far side). Since the earth is moving while this is happening, two tides occur each day.

external image Tides1.bulges.png