Do Now 1. ______deep v shaped cut in the c. shelf and c. slope 2.______flattest part of the ocean floor 3. _____flat topped seamount 4. _____pointy extinct volcano 5. _____longest underwater mountain range

Key Questions 1.What are tides? 2.What causes tides? 3.Why does the moon have more of an affect on the tides than the sun? 4.What is high tide? 5.What is low tide? 6.How often do tides occur? 7.What is a spring tide? 8.What is a neap tide?

1. What are tides? 1. Tide is a daily rise and fall of Earth’s ocean water.

2. What causes tides? 2.Tides are caused by the gravitational pull of the moon and sun.

3. Why does the moon have more of an affect on the tides than the sun? 3. The moon has more an affect on the tides because it is closer to the Earth.

4. What is high tide? 4. High tides are the bulges of water that occur where the moon is directly facing the Earth and on the opposite side.

5. What is low tide? 5. Low tides are places on Earth where water is drawn away from the area between the high tides.

6. How often do tides occur? There are four tides a day: 2 high and 2 low every 6 hours –4x6=24…24 hours in the day

7. What is a spring tide? When the Earth, sun and moon are aligned. When the Earth, sun and moon are aligned. Produce the highest high tide and the lowest low tide Produce the highest high tide and the lowest low tide occur during the new and full moons. occur during the new and full moons. occur every 14 days. occur every 14 days. The first time they occur is when the moon is between the sun and the Earth. The first time they occur is when the moon is between the sun and the Earth. The second time is when the moon and the sun are on opposite sides. The second time is when the moon and the sun are on opposite sides.

Spring Tides

8. What is a neap tide? When the sun, Earth and moon form a 90 0 angle the sun and moon work against each other occur on the first and last quarter moons. occur halfway between spring tides The least difference between high and low tide

Neap Tides