How does coal differ from pine trees as a source of energy? a. coal can be replaced easily, while pine trees are difficult to replace. b. coal is a nonrenewable resource, while pine trees are a renewable resource. c. coal is a clean source of energy, while pine trees cause environmental damage. d. coal is an expensive source of energy, while pine trees are an inexpensive source of energy.

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