The sun's apparent motion across the sky from east to west daily is due to the a) rotation of the sun. b) rotation of the earth. c) orbit of the earth around the sun. d) orbit of the sun around the earth.

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.