O2, CO2 and H2O Earring

Mix and Match earrings of Oxygen, Carbon Dioxide and Water molecules. They are the three essential gases that are important for all living creatures on the earth.  Oxygen (O2) is a colorless, odorless reactive gas and the life-supporting component of air. It forms just under 21% of the earth's atmosphere, and is the most abundant element in the earth's crust, Carbon dioxide, (CO2), a colorless gas having a faint sharp odor and a sour taste. It is one of the most important greenhouse gases linked to global warming, but it is a minor component of Earth’s atmosphere (about 3 volumes in 10,000). Water (H2)O) is present in variable amounts in the atmosphere, from 0 % to 4 %. Unlike oxygen and nitrogen, the concentration of H2O depends on local weather conditions and changes greatly from place to place on Earth. Clouds form preferentially over dark vegetation and just downwind of mountain ranges. The water in the atmosphere makes up only a very small percentage of the total water on Earth.