Scientists believe that Mashkan-shapir's collapse was caused in part by destruction of the fields by mineral salts. When mineral salts concentrate in the upper levels of the soil, it becomes poisonous for plants. In Mesopotamia, irrigation was essential for crop production.
On Jan. 20, Kamala Harris will become vice president of the United States – the first woman, the first person of South Asian descent, and the first African American to do so. Harris will also become the first vice president to have graduated from a historically black college or university.
Each of these achievements is significant in its own right. However, the vice presidency itself has traditionally been a relatively insignificant position, though the office has become more influential in recent years.
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"He initially refrained from committing ground forces after being advised that North Koreans could be stopped solely by America's superior air and naval power."
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This intricate canyon system features an abundance of high sandstone cliffs, rock shelters, waterfalls, and natural bridges.
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