1. Ocean Tides

2. Tides Changes in the level of ocean water during the course of a day Changes in the level of ocean water during the course of a day The ocean levels reaches a high and low level twice a day The ocean levels reaches a high and low level twice a day

3. High and Low Tides High tide – Water is pushed up onto the shore High tide – Water is pushed up onto the shore Low tide – 6 hours later when water is pulled away from shore Low tide – 6 hours later when water is pulled away from shore

4. What causes the tides? The pull of gravity between Earth, the moon, and the sun The pull of gravity between Earth, the moon, and the sun Water in the oceans form a bulge on the side of Earth facing the moon. Water in the oceans form a bulge on the side of Earth facing the moon. While on the other side (away from the moon), a bulge forms because the water is thrown outward While on the other side (away from the moon), a bulge forms because the water is thrown outward

5. Causes of tides Water in the oceans tries to travel away from Earth’s orbit, but Earth’s gravity keeps the water from flying off into space. Water in the oceans tries to travel away from Earth’s orbit, but Earth’s gravity keeps the water from flying off into space.

6. Spring Tides Spring tides occur during the full moon and the new moon Spring tides occur during the full moon and the new moon The high tides are very high and the low tides are very low The high tides are very high and the low tides are very low

7. Neap Tides Neap tides occur during first and third quarter moons Neap tides occur during first and third quarter moons There is a small difference between high and low tides. There is a small difference between high and low tides. The high tides are not as high and the low tides are not as low. The high tides are not as high and the low tides are not as low.