Which of the following is true regarding 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 a period of many years.
(d) The sea level along the Gulf Coast is the lowest for the coasts of the lower 48 states.


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

Environmental & Atmospheric Sciences

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