14.4 Tides (p. 432-435) Bell Ringer: Copy Objectives & lesson title in your IAN. 1. What are the daily changes in the level of ocean water? 2. How are tides influenced by sun and moon? 3. Why/How do they occur in cycles? 4. Describe the change of 2 high tides and 2 low tides per day

The Lure of the Moon The gravity of the moon pulls on the water and every molecule on Earth. Although gravitational forces from both the sun and moon continuously pull on the Earth, the moon’s gravity is the dominate force. Why??? Brainstorm

Well, let’s compare the size: if the moon had the mass of a golf ball, the sun would have the mass of 110 school buses. So why is the moon’s gravitational pull still stronger? A gravitational pull decreases with distance. The sun is almost 150 million km away, but the moon is only 385,000km away. Size & distance

High Tide and Low Tide The tide’s pull is strongest on the side of the Earth facing moon. This is called the Battle of the Bulge.

Battle of the Bulge ? The part of the ocean facing the moon bulges toward the moon, leaving the far side of the ocean behind. High tide-bulges Low tide-area where water is pulled away High Tide Low Tide

Timing the Tides Earth’s rotation on it’s axis and moon’s revolution around Earth determine when the tide occurs.

Click for mini video lesson! Tides: How would you define them? Explanation of how the Tides Work!

Tidal Variations High tide=20 ft Low tide=10 ft Tidal range = 10 ft Remember: The sun affects tides, but not as much as moon— further away. The combined forces of the moon & the sun result on the tidal ranges that exist. Tidal range- difference between water levels at high tide and low tide. High tide=20 ft Low tide=10 ft Tidal range = 10 ft

Spring Tides: They are tides with the largest daily tidal range= Highest highs, lowest lows This occurs during the new and full moons; every 14 days Earth, Sun and Moon in alignment Draw Me!

Neap Tides: Tides with the smallest daily tidal range between tides Sun, Earth, moon at 90 degree angle. Draw Me!

In Summary: ***Remember your Water Wise unit test is this Friday! Make sure you are reviewing your Study Guide glued in your IAN. *** Tides Brainpop Immunity Challenge!

Welcome to Survivor Island https://www.youtube.com/watch?v=XgixiXxNavo

Survivor Mail Sponge Bob Trivia He lives in a pineapple under the sea. Immunity Challenge Sponge Bob Trivia He lives in a pineapple under the sea. His body is full of pores. He will help you review the unit And open the challenge doors! Survivor Mail

Tribal Council The winner of an immunity challenge will be announced at the start of the next class and tribal council will be held. All tribes will vote for one tribe to lose 20 of the points that were earned on the last immunity challenge. Each tribe will have only one vote during each tribal council. Tribal Council Music