The valleys around the nile, euphrates, and tigris rivers were probably

a.
where the first farmers settled.

b.
the location of a major battle between egyptians and sumerians.

c.
a glacier in ancient times.

d.
first discovered during the 1700s.

The solstices and equinoxes, and the number of hours of daylight associated with each, are major factors in the seasons. use the drop-down menus to identify the month when each of these events occurs. the winter solstice in the northern hemisphere: an equinox in both hemispheres: the summer solstice in the northern hemisphere:

What first caused people to consider that the continents were once one large landmass?

Which ecosystem best fits the characteristics listed below? which ecosystem best fits the characteristics listed below? ii. seasonal migrations of millions of wildebeests, zebras, and elephants iii. large numbers of predators, such as lions iv. acacia trees and grasses a. the congo rainforest b. the african mangroves c. the serengeti grasslands d. the sahel