The layers of the atmosphere are kept separate due to
a. air pressure
b. air composition
c. changes in elevation
d. changes in temperature trends

The creation of the european union has had all of the following effects except

The nations of indochina a. share a common langauge b. share a common history c. share a common religion d. none of the above

Humans have built artificial levees along the mississippi river to protect themselves and their property from floods. however, these structures also modify inland and coastal regions by disrupting the natural flow of sediment. artificial levees along the mississippi river a. reduce the amount of sediment deposited on floodplains and increase the amount of sediment deposited at the river's mouth. b. increase the amount of sediment deposited on floodplains and decrease the amount of sediment deposited at the river's mouth. c. increase the amount of sediment deposited on floodplains and at the river's mouth. d. decrease the amount of sediment deposited on floodplains and at the river's mouth.