Answer:
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.\
Railroads in the 1800's were used to transport goods to other locations
The most highly developed geocentric model was that of Ptolemy of Alexandria (2nd century ce). It was generally accepted until the 16th century, after which it was superseded by heliocentric models such as that of Nicolaus Copernicus.
There were growing tensions between Malcolm X and the Nation of Islam.
Answer:
im pretty sure its D
Explanation:
the definition for civilization is "the stage of human social and cultural development and organization that is considered most advanced"
