1. Tides

2. Tides Tides are caused by the gravitational pull of the moon, sun and by the rotation of the earth, moon and sun. Tides are caused by the gravitational pull of the moon, sun and by the rotation of the earth, moon and sun.

3. Tidal Cycle Tidal cycle – Because the moon spins on its axis a bit slower than Earth, we go through a complete tidal cycle every 24 hours 50 minutes. Tidal cycle – Because the moon spins on its axis a bit slower than Earth, we go through a complete tidal cycle every 24 hours 50 minutes.

4. Spring Tides Spring Tides – when the sun, Earth and the moon are “lined up”. This creates a large tidal range. Spring Tides – when the sun, Earth and the moon are “lined up”. This creates a large tidal range. high tides are higher than normal high tides are higher than normal low tides are lower than normal low tides are lower than normal

5. Neap Tides Neap Tides – When the sun, Earth and moon are perpendicular to each other. This creates a small tidal range. Neap Tides – When the sun, Earth and moon are perpendicular to each other. This creates a small tidal range. high tide is lower than normal high tide is lower than normal low tide is higher than normal low tide is higher than normal

6. 3 Types of Tides 1. Semidiurnal tides – 2 high and 2 low tides of equal height. Occur on the east coast of U. S.

7. Types of Tides, cont’d. 2. Diurnal tides – one high and one low tide. Occur in Antarctica, Gulf of Mexico, and Caribbean.

8. Types of Tides, cont’d. 3. Mixed (semidiurnal) – two high and two low tides but they are unequal. Occurs on the Pacific Coast of the United States and Canada.