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.
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Explanation:
The earth rotates on its own axis. When the rotational axis of the earth changes, it leads to precession. Earth's precession is a common phenomenon that has been observed by astronomers for a long time. The effect of changing axis of rotation would be the amount of solar radiation that would be received at any point on the earth.
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Soil salinity is the salt content in the soil. Salination can be caused by natural processes such as mineral weathering or by the gradual withdrawal of an ocean.
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