Which of the following is true regardng mean sea level?

(a) A consistent value has yet to be determined due to all the variables.





(b) It is at the same level along the entire North American coast.





(c) It is calculated based on average tidal levels recorded hourly at a given site over many years.





(d) The sea level along the Gulf Coast is the lowest for the coasts of the lower 48 states.Which of the following is true regardng mean sea level?
The answer is C, I believe.Which of the following is true regardng mean sea level?
The answer is defiitely ';C';.





To start, remember that ';mean'; is the same as ';average';, thereby giving away the answer anyway.





In general, the Moon exerts a gravitational pull on the Earth, such that the sides of the Earth facing both directly Toward and Away from the Moon will always ';feel'; those effects, resulting in ocean heights which change over the course of a day... hence High and Low tides (due to those tidal forces).





Therefore, for Mean Sea Level to be computed, oceanographers will measure sea levels (always at the same locations) over a regular period of time, and they take a statistical average (i.e. the ';mean';) to report a result representing all locations measured.

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