During the evening, cold air from mountaintops rushes into the valleys below. Why does this occur? O A. Cold air is less dense than warm air, causing the cold air to sink. B. Global wind patterns cause this wind movement at night. O C. Cold air is denser than warm air, causing the cold air to sink. D. As clouds develop on the mountaintops, precipitation causes wind movement.​

The majority of sulfur dioxide produced by industry comes from a. oil refineries. b. dry cleaners. c. chemical plants. d. coal-burning power plants.

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Drag each label to the correct location on the image. each label can be used more than once. a scientist introduced mutations in a gene sequence isolated from bacteria. study the sequence, and identify the steps where the mutations may affect the formation of proteins. in the sequence, black letters stand for protein coding regions and red letters stand for noncoding regions. protein will not be changed. protein may be changed. attcgtgttc atcgtgttc atcgtattc attcgtattc