Describe the flow and conservation of energy in a coal-fired power plant

Tides that occur during the new and full moons

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

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%