Waves & photons. Transverse (top) and Standing wave longitudiinal waves.
What causes waves? Wind Waves also occur in rivers, lakes, and puddles.
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Transcript of What causes waves? Wind Waves also occur in rivers, lakes, and puddles.
Earth Science Rocks!Warm Up January28
What causes waves? Wind
Waves also occur in rivers, lakes, and puddles.
•MYP Unit Question: How do we use water?
•Area of Interaction: Health and Social Education
•Learner Profile: Thinker and Balanced
•Standard: Recognize the significant
role of water in the Earth’s processes.
•Learning Standard: I’m learning about currents
because they move water through the oceans.
Earth Science Rocks!• Opening: Survivor IMMUNITY
Challenge
• Work Session: Notes over Tides
• Closing: Tide Simulation
So what causes tides?The word "tides" is a basic term used to define the alternating rise and fall in sea level with respect to the land.
Tides are produced by the gravitational pull of the moon and the sun.
•Bay of Fundy •known for having the
highest tidal range in the
world.Atlantic OceanGulf of Maine,
U.S.
Tidal Bulges...
The water “bulges” toward the moon because of the moon’s gravitational pull.
HIGH TIDEHIGH TIDE
LOW TIDE
LOW TIDE
• Draw this image on your foldable under TIDES.
The moon at work...• The water is pulled
toward the moon at point A.
• The water is pulled AWAY from the sides perpendicular to point A.
Did you figure it out?
In general, there are 2 high tides and two low tides each day.
Because the Earth rotates more quickly than the moon revolves around the Earth, tides do not occur at the same time each day.
So why are tides not exactly 12 hours apart?
• Since the moon moves around the Earth, it is not always in the same place at the same time each day. So, each day, the times for high and low tides change by 50 minutes.
Spring & Neap TidesThe Moon doesn’t work alone. Remember the Sun’s gravity also affects tides.
• SPRING TIDES The Sun & Moon may work together to produce higher than normal tides.
• NEAP TIDES The Sun & Moon may work against each other to produce lower than normal tides.
How often do Spring & Neap tides occur?
• Uh…I need to see that picture again before I can answer that!
• I know the answer. Let’s move on.