Identify the chemical change below A. a piece of wood burns in a fire
B. two pieces of paper are stapled together
C. a large log is cut into boards
D. water is removed by drying wet clothes on a laundry line

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