The moon's gravitational force pulls water towards it, creating a high tide on the surface of the ocean closest to the moon. Also, the centrifugal force created by the Earth and moon orbiting around a central point creat... More »

Tides form when the gravitational forces of the moon and sun act on the Earth as it spins around its axis. Tides are the rise and fall of the sea level in reference to land. For example, spring tides are the result of th... More » Science Weather & Tides Tides

The Fitzgerald Marine Reserve near Half Moon Bay, Calif. is an easily accessible part of the coastline. The Fitzgerald Marine Reserve borders the Gulf of the Farallones National Marine Sanctuary and is home to the Montar... More » Sports & Active Lifestyle Water Sports & Activities

High tide occurs on the side of the Earth that is opposite of the moon during orbit, while the side of the Earth closest to the moon experiences low tide. The gravitational pull of the Earth and moon causes high and low ... More »

The beaches in Siesta Key, Fla. periodically experience red tide, a condition that occurs when high levels of red-tinted and harmful algae are present in the water. During red tides, the ocean water may display a reddish... More » Science Weather & Tides Tides

All tides, including the cycle of spring and neap tides, are caused by the gravitational pull of the sun and moon on Earth's ocean tides. Each month, the angles and alignment of the sun, moon and Earth work to influence ... More »

Waves are caused by wind blowing on the ocean surface. Stronger winds cause larger waves. Variations in wind speed and duration determine the size and frequency of waves. The horizontal length of the wave is established ... More » Science Weather & Tides Tides