On a warm, sunny day, a glass of water seems to slowly disappear. This is because the energy from the sun the water and turns the liquid water into water . This process is called . When the water, it becomes a gas in the .

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere