Mean low water is the average height of...

Question 1 / 2066636ee928f7522a1c519bc0

Question 1 of 2066636ee928f7522a1c519bc0

Mean low water is the average height of __________.

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Question 1 of 20

66636ee928f7522a1c519bc0

Mean low water is the average height of __________.

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🔍 Key Concepts

• Tidal datums used on nautical charts • Difference between mean low water and a single low tide event • How averages are calculated over a long period (e.g., 19 years)

💭 Think About

• Is mean low water based on just one of the daily lows, or on more than one kind of low tide over time? • Does mean low water refer to a single tide occurrence, or to a statistical average used as a chart reference level? • Which choice best matches a long-term average of low tides only, rather than including highs?

✅ Before You Answer

• Make sure the option you choose refers only to low waters, not highs and lows mixed together • Check that the definition implies an average over many days/years, not a single day’s tide • Confirm that the wording matches a datum used for chart depths, not simply a description of the ocean surface

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Question 1 of 20

Mean low water is the average height of __________.

high waters and low waters

the lower of the two daily low tides

the surface of the sea

all low waters

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