1. Ocean Motions What causes tides? Tidal chart
Chapter Four
Prentice Hall

2. Background Info
What is gravity?

3. Tides- The daily rise and fall of Earth’s waters on its coastlines are called tides. Science on the Spot: Tides
Tides are caused by the interaction of Earth, the moon, and the sun. The moon’s gravity pulls on the water on the side closest to it more strongly than it pulls on the center of the Earth. This pull creates a tidal bulge (high tide) on the side facing the moon. The water left behind on the other side of Earth creates a 2nd bulge while water at the top and the bottom of the Earth creates a low tide.
This happens about twice a day in most places on Earth.
Tide Simulator
Bay of Fundy - highest tides of the world

4. Monthly Tide Cycle- changes in the positions of Earth, the moon, and the sun affects the height of tides during a month. animation
Neap Tide
Spring Tide
Twice a month, at the new moon and the full moon, the sun and moon are lined up. Their combined gravitational pull produces the greatest range between high tide and low tide, called spring tide.
In between spring tides, at the first and the third quarters of the moon, the sun and moon pull at right angles to each other. This line-up produces a neap tide, a tide with the least difference between high and low tide. During this tide, the sun’s gravity acts to pull some of the water away from the tidal bulge.

5. Let’s Model more tides

6. You will learn more about ocean motions
In the ppt of currents and climate

7. Kinda Cool
10 Amazing Places that Disappear with High Tide