Study

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
  • 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
  • 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).
  • 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.
  • What is a place where ships dock and unload goods?
    Harbour
  • Which word means the distance from the water’s surface to the sea floor?
    Depth
  • 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.
  • What do we call the pull of the Moon’s gravity that moves water on Earth?
    tidal force
  • The regular rise and fall of the sea level along the shore is called a _______.
    Tide
  • 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
  • The tidal range is 1.2 m. The low tide is 4.8 m deep. What is the high tide depth?
    6.0 m