Pecandemy

Earth and space

6.9(B)

Why Ocean Tides Rise and Fall

Describe and predict how the positions of the Earth, Sun, and Moon cause daily, spring, and neap cycles of ocean tides due to gravitational forces.

Part of The student models the cyclical movements of the Sun, Earth, and Moon and describes their effects

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Intro

Tides: Earth, Sun, and Moon

A tide is the regular rise and fall of the ocean's surface along a coast. If you stood at Galveston or Port Aransas in the morning, then returned in the afternoon, the water might be much higher or lower on the sand. That change is a tide.

Why Earth Has Seasons38 of 49Earth's Four Big Systems