Topic: TIDES
Objectives:
- Describe the arrangement of the sun, moon, and earth during spring and neap tides.
- Provide evidence that supports the claim that the moon’s effect on tides is greater than the sun.
ESSENTIAL QUESTION:
What causes tides?
Tides are the rise and fall of sea levels caused by the Sun and ______’s ______acting on the oceans.
The Sun and the Moon both influence tides because of their ______. However, the Moon has ______the gravitational pull on our oceans.
The Moon is ______than the Sun, so its gravitation pull is ______.
TheLaw of Universal Gravitationstates:
The greater an object’s ______, the greater its ______(and vice versa)
The greater the ______between two objects, the ______the gravity is. (and vice versa)
Check for understanding:
Why is the Moon the main cause of tides and not the Sun?
What are spring tides?
Spring Tides: When the gravity of the Moon and the Sun ______(Full and new MOON) in order to increase water levels. ______difference between high/low tides.
Spring Tides Diagram:
What are neap tides?
Neap Tides: When the gravity of the Moon and the Sun are at _____ angles (First and Third QUARTER) and work against each other. ______difference between high/low tides.
Neap Tides Diagram:
Check for understanding:
Allyse’s family lives near the beach. Every day there is a high tide and a low tide. Allyse notices that sometimes the high tides are higher and the low tides are lower than they are at other times. She realizes that this happens in a predictable pattern. What causes the highest of high tides and the lowest of low tides to occur?
How to interpret tide data
Tidal Range is the difference between the levels of the ocean water at high tide and low tide. Spring tides have the largest daily tidal range while neap tides have the smallest daily tidal range. There are usually 2 high tides and 2 low tides that occur daily.
Tides Summary Questions
1. Review your notes by circling the vocabulary words and underlining the definitions. The vocabulary words are: tides, law of universal gravitation, spring tides, neap tides, tidal range.
2. Why does the Moon have 2x the gravitational pull on the Earth’s oceans?
3. If a Hurricane was to hit Jacksonville, during which Moon phase would we most likely experience the greatest amount of damage? Explain why.
4. What kind of tides would occur in the diagram below↓? ______
5. What can you predict about the difference between high and low tides in the diagram to the right →? ______
6. What kind of tides would occur in the diagram below↓? ______
7. What can you predict about the difference between high and low tides in the diagram to the right →? ______
8. 8. Draw the phases of the moon around the earth below. Label neap tides with a a N and spring tides with a S
9. The law of universal gravitation is used to explain the Moon’s effect on our tides. Why is this a law and not a scientific theory? (Hint: see science saurus pg. 2)
10. In this lesson today, you drew different diagrams about tides. Explain how these drawings are scientific models. (Hint: see science saurus pg. 2)