Answer:
the sun and moon cycle takes up 24 hours, so that is why a whole day is considered 24 hours. there are 7 days in a week based on the earths rotation and position on its axis. there are 12 months in a year because of the lunar cycles, there are just a little bit over 12 in a year. we also have been following this stuff since the time of the ancient babylons and maybe even before.
The crust and the upper mantle.
Heat convection. Convection is heat transfer by mass motion of a fluid such as air or water
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Cattle ranching causes erosion which removes soil by wind or water.
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