How could shifts in the physical environment have caused major changes in early civilizations? Select all that apply. Earthquakes or erupting volcanoes may have destroyed communities. Buildup of silt could have made rivers less salty, increasing the supply of clean water. Long-term farming could have improved the quality of the soil, increasing crop yields. Too much or too little rain may have ruined crops, creating food shortages.

A.Too much or too little rain may have ruined crops, creating food shortages.

A.Earthquakes or erupting volcanoes may have destroyed communities.

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It is not C, because silt makes rivers even MORE salty, and does not give clean water

It is not D, because long-term farming wears out the farmland, and you will not be able to grow more than you used to, because the nutrients inside the soil is dwindeling

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the answer is a. since they were a huge producer of cotton and wanted the most money for it.

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