What makes water move through the water cycle? A the sun the rain C precipitation the ground​

True or false: the revolution of the earth creates day and night as it rotates around the sun

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

The ph is the a.independent variable b.the dependent variable c.control group