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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.
If high tide happens at 6 a.m., when will the next high tide occur?
Around 6PM
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.
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).
The tidal range is 1.2 m. The low tide is 4.8 m deep. What is the high tide depth?
6.0 m
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
Which natural event can also be slightly affected by Earth tides?
Earthquakes
Why can some boats in a harbour move only during high tide?
Because the water is too shallow at low tide.
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
Which word describes the total change between high tide and low tide?
tidal range
What is a place where ships dock and unload goods?
Harbour
What do we call the pull of the Moon’s gravity that moves water on Earth?
tidal force
Which word means the distance from the water’s surface to the sea floor?
Depth
The regular rise and fall of the sea level along the shore is called a _______.
Tide
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