Changes in daylength and the Sun's altitude above the horizon over the course of the year
A) produce Earth's rotation.
B) are phenomena that occur only at the equator.
C) are responsible for the seasons.
D) are factors that follow an irregular, random cycle.
Question 2
Which of the following is correct regarding mean sea level?
A) A consistent value has yet to be determined due to all the variables involved in producing the tides.
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) It has very little variability across all ocean basins and, therefore, is treated as an absolute value.
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