PLEASE HELP ME Global warming is the rise of average temperatures across the globe. Some evidence suggests that it is caused by . *

-heat energy being trapped near the surface by gasses.
-increased volcanism.
-the Earth's rotation around the sun.
-the tilt of the Earth on its axis.

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.