People often get painless little bumps under their skin, called cysts. Cysts can develop on most parts of the body. Some are found in hair follicles. They can develop for many reasons -- and sometimes for no obvious reason. They are more common in men than in women. Skin cysts donât need treatment most of the time. Theyâre usually painless and nothing to worry about, unless they get sore or infected. But if you have a cyst that bothers you or is embarrassing, you should discuss it with your doctor.
Of this total supply, about 50-60 percent either is used by native vegetation, evaporates to the atmosphere, provides some of the water for agricultural crops and managed wetlands (effective precipitation); or flows to Oregon, Nevada, the Pacific Ocean, and salt sinks like saline groundwater aquifers and the Salton Sea.
Forests are considered one of the worldâs largest banks for all of the carbon emitted into the atmosphere through natural processes and human activities. They cover about 30 percent of Earthâs land surface, while accounting for 50 percent of plant productivity. As much as 45 percent of the carbon stored on land is tied up in forests. Forests cover 30 percent of the Earthâs land. (Map by Robert Simmon, based on data from the MODIS Land Cover Group, Boston University.)