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Published byCaroline Norris Modified over 9 years ago
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Tidal Movements
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Tides: the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and rotation of the Earth.
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What causes tides? Gravitational pull from the moon and sun
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How many tides in 24 hours? 2 high tides and 2 low tides Excess water is called a “dome”
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Ebb: low flow of water
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Flood: high flow of water
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High tide: maximum flow of water on a beach
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Low tide: minimal flow of water on a beach
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Time between high and low tides = a “rest”
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Peak of a high or low tide is a “slack”, not changing.
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Different types of tides
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Different types of tides Spring tide: lunar and solar domes coincide. Higher than a high tide, or lower than a low tide.
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Different types of tides Neap tide: high tide is lower than normal. Low tide is higher than normal
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Science Textbook Using the Earth Science Textbooks (Orange), open to Pages 492 – 496. Read through the text and write a paragraph in your journal explaining why and how tidal movements occur on your EQ#4 page. Textbooks can be checked out from NW library. Classroom textbooks need to stay in the classroom.
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