Billy is sitting in a chair in class. if the action force is the downward push of his weight on the chair, what is the reaction force?
a. there is no reaction force
b. the upward force of the chair pushing on billy
c. the downward force of billy's weight on the earth
d. the upward force of the earth on billy

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases