As the runoff flows, it may pick up loose bits of soil and sand. Runoff causes more erosion if the land is bare. ... Much of the material eroded by runoff is carried into bodies of water, such as streams, rivers, ponds, lakes, or oceans. Runoff is an important cause of erosion.
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We need to assume that the orbits are circular; this is a very good approximation and do not hesitate to adopt it. We need then to consider the basic equation of circular motion that relates centripetal acceleration, angular velocity, mass, radius and force:
. We also have the basic equation of Newton, F=ma. By checking, we see that for each planet we have that a=v^2*r where v is the angular velocity. v=
where T is the orbital period, hence we have that a=
. Denote with the index 1 the Earth case and with 2 the Mars case. We have then that
. Substituting the known values in a calculator, we get the result: the centripetal acceleration of earth is 2.32 times greater than that of Mars.
The sun shines in summer, whereas it does not in winter...
Answer:
In the spring, when melted snow from nearby mountains flowed into the Tigris and Euphrates and the rivers overflowed their banks, the crops that were ready for harvest could be destroyed. Often, the floods ruined an entire harvest. Livestock, including cows, pigs, and sheep, were often drowned by the floodwaters.
Between the 1870s and 1900, Africa faced European imperialist aggression, diplomatic pressures, military invasions, and eventual conquest and colonization. At the same time, African societies put up various forms of resistance against the attempt to colonize their countries and impose foreign domination.
