Hoovervilles and the economy. As the economic crash of the 1930s dragged on, more and more people were ruined. Delinquent taxes, drastically rising unemployment and mortgage foreclosures were heavy burdens to overcome. Those factors forced ordinary people to either move into Hoovervilles or become transients.
Carbon is the sixth most common element in the universe and the fourth most common element in the solar system. It is the second most common element in the human body after oxygen. About 18 percent of a person's body weight is due to carbon. The black color of smoke is caused by unburned specks of carbon.
However I think you are asking what elements are involved in organic chemistry. All organic compounds contain Carbon and hydrogen. Often Oxygen is incorporated and other common elements include Nitrogen, Phosphorus and sulphur. The question does not make sense to me. However I think you are asking what elements are involved in organic chemistry. <br />All organic compounds contain Carbon and hydrogen. Often Oxygen is incorporated and other common elements include Nitrogen, Phosphorus and sulphur.