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3.4 Tides
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If it’s low tide at 3 p.m., when is the next high tide?
Around 9 p.m.
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If high tide happens at 6 a.m., when will the next high tide occur?
Around 6PM
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When the Moon and Sun pull from different angles, the difference between high and low tide is small. What kind of tide is this?
Neap tide
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Which word describes the total change between high tide and low tide?
tidal range
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A scientist records the lowest tide at 2 m and highest tide at 6 m. What is the tidal range, and what could cause it to be large?
4 m; Sun and Moon pulling together (spring tide).
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Why might a place with a very small tidal range be safer for building a harbour?
Because water levels don’t change much, making docking easier.
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What is a place where ships dock and unload goods?
Harbour
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Which word means the distance from the water’s surface to the sea floor?
Depth
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Which natural event can also be slightly affected by Earth tides?
Earthquakes
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Why can some boats in a harbour move only during high tide?
Because the water is too shallow at low tide.
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What do we call the pull of the Moon’s gravity that moves water on Earth?
tidal force
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The regular rise and fall of the sea level along the shore is called a _______.
Tide
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In a coastal area, the high tide depth is 8 m and the low tide depth is 3 m. What is the tidal range?
5 m
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The tidal range is 1.2 m. The low tide is 4.8 m deep. What is the high tide depth?
6.0 m
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