Figure 11. 1 on page 398 shows in part how sulfur moves in the environment as a result of human activities. It sulfur emitted by erupt the movement 名 of sulfur int then back out of decaying plants. Sulfur element in the arth' s crust WI abundance of about ppm. The vast ajority form 道喜 sulfates 日 mostly gypsum the principal 夏了 anhydrite CaSO4 G Inert, nontoxIc, water-solu m fow of sulfur in the envirunment, as influenced by humans. This figure omits the large amounts of mineral uble 11.1 some volcanic eruptions release, and the flow into and out of the atmosphere to growing and found widely throughout the world All organic fuels used by humans(oil, coal, natural gas, peat, wood, other organic matter)contain some sulfur. Fuels like wood have very little(0. I per center less), whereas most coals have 0.5 percent to 3 percent(see Appendix C). Oils generally have more sulfur than wood but less than coal. If we burn the fuels, the contained sulfur will mostly form sulfur dioxide S+O2-->SO2 (in fuel) If we put this into the atmosphere, it will eventually fall with precipitation, mostly in the ocean (because most of the worlds rain falls on the ocean), and over time become part of the land mass as a result of geologic processes. Again over geologic time, it will enter into fossil fuels and l1-211－2 Figure 11.1 on page 398 shows in part how sulfur moves in the environment as a result of human activities. It does not include the large amounts of sulfur emitted by volcanic eruptions nor the movement of sulfur into growing plants and then back out of decaying plants. Sulfur is the sixteenth-mos t abundant element in the earth's crust, with an abundance of about 260 ppm. The vast majority of this sulfur exists in the form of sulfates, mostly as gypsum, CaSO4 .2H20, the principal ingredient of plaster and wallboards, or anhydrite, CaSO4. Gypsum is a chemically inert, nontoxic, slightly water-soluble mineral, found widely throughout the world. All organic fuels used by humans (oil, coal, natural gas, peat, wood, other organic matter) contain some sulfur. Fuels like wood have very little (0.1 per center less), whereas most coals have 0.5 percent to 3 percent (see Appendix C). Oils generally have more sulfur than wood but less than coal. If we burn the fuels, the contained sulfur will mostly form sulfur dioxide, S +O2 ---> SO2 (11.1) (in fuel) If we put this into the atmosphere, it will eventually fall with precipitation, mostly in the ocean (because most of the world's rain falls on the ocean), and over time become part of the land mass as a result of geologic processes. Again over geologic time, it will enter into fossil fuels and