The primary use of fresh water is to sustain life, as all forms of life on Earth require it. Aside from drinking some other major uses are for irrigation, sewage systems, cleaning, electricity production and as a means o... More »

Water is not an organic molecule because it does not contain any carbon. Organic molecules must have both hydrogen and carbon in them; however, a water molecule only contains hydrogen and oxygen. More » Health Nutrition & Diets Nutritional Content

Water is a molecular compound formed from the elements oxygen and hydrogen. It is the most abundant molecule on Earth and is essential to life on the planet. More » Science Chemistry Atoms & Molecules

The Dead Sea, also known as the Salt Sea, is the saltiest body of water on Earth and only supports the life of bacteria and other simple life forms. The Dead Sea cannot support many life forms common in other large bodie... More »

Nitrogen is important to life because it comprises approximately 80 percent of the Earth's atmosphere and is present in all living things as a part of proteins and DNA, according to the Marine Biological Laboratory. Nitr... More »

According to National Geographic, non-renewable energy sources, such as fossil fuels, are energy dense and easy to extract and transport, but the ecological damage caused by burning such fuels makes them a dangerous opti... More »

Carbon dioxide is important because it is used in photosynthesis, a process that is necessary for the survival of life on Earth. Carbon dioxide is also a vital greenhouse gas that helps trap heat in the atmosphere, and i... More »