The thinning of the troposphere away from the equator is primarily a result of land masses moving towards the poles. shifting of the continental plates due to plate tectonics. differences in solar energy striking the earth the number of clouds in the mesosphere and thermosphere

Tides are caused by a differences in the gravitational force of the sun at different points on earth. differences in the gravitational force of the moon at different points on earth differences in earth’s gravitational field strength at different points on earth’s surfac fluctuations in the gravitational attraction between earth and the moon.