At the equator, the sun is directly overhead at noon on these two equinoxes. the nearly equal hours of day and night is due to the refraction of sunlight or bending of lights Ray's that causes the sun to appear above the horizon when the actual position of sun is below the horizon.
<span>Waters in the eastern Pacific steadily gets warmer
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El Nino is caused by the periodic shift in wind speed and direction in the tropical eastern Pacific which leads to changes in sea Surface temperatures.
migration rates,birth rates and death rates are all ways to measure changes in the population?
