1. Tides

2. Take-Away Points 1.Tides in the ocean are caused by both the Sun and Moon 2.Tides occur because the Sun and Moon pull stronger on one side of the earth than the other 3.There are two tidal bulges on opposite sides of the Earth 4.Solar and Lunar tidal effects can reinforce or weaken each other 5.Actual tide motions in the oceans are very complex 6.Tides are gradually slowing the earth’s rotation

3. There are Two Tidal Bulges 3. There are two tidal bulges on opposite sides of the Earth

4. Both Moon and Sun Cause Tides 4. Solar and Lunar tidal effects can reinforce or weaken each other

5. Tides and the Boston Tea Party, December 16, 1773 Near Earth's perihelion: strong solar tides Near lunar perigee: strong lunar tides Full moon on December 13: spring tide Overall effect: unusually large tidal range 4. Solar and Lunar tidal effects can reinforce or weaken each other

6. The Boston Tea Party, December 16, 1773 4. Solar and Lunar tidal effects can reinforce or weaken each other

7. Tides and the Battle of Tarawa, November 20, 1943 Near Earth's perihelion: strong solar tides Near lunar apogee: weak lunar tides Near last-quarter moon: neap tide Overall effect: unusually small tidal range 4. Solar and Lunar tidal effects can reinforce or weaken each other

8. Location of Tarawa 4. Solar and Lunar tidal effects can reinforce or weaken each other

9. The Attack on Tarawa 4. Solar and Lunar tidal effects can reinforce or weaken each other

10. Tarawa: What the Planners Wanted 4. Solar and Lunar tidal effects can reinforce or weaken each other

11. What Actually Happened 1027 Marines killed, 2292 wounded 4. Solar and Lunar tidal effects can reinforce or weaken each other

12. Tides and the Real Oceans 5. Actual tide motions in the oceans are very complex

13. How Tides Move in the Oceans 5. Actual tide motions in the oceans are very complex

14. Tides on the Real Earth 5. Actual tide motions in the oceans are very complex

15. Tides Affect Earth's Rotation 6. Tides are gradually slowing the earth’s rotation

16. Take-Away Points 1.Tides in the ocean are caused by both the Sun and Moon 2.Tides occur because the Sun and Moon pull stronger on one side of the earth than the other 3.There are two tidal bulges on opposite sides of the Earth 4.Solar and Lunar tidal effects can reinforce or weaken each other 5.Actual tide motions in the oceans are very complex 6.Tides are gradually slowing the earth’s rotation