Natural gas is a fossil fuel widely used for multiple energy needs. This book looks at a variety of issues in the use of natural gas as an energy source.
The United States has approximately 272 million tons (247 million tonnes) of coal in its reserves. About 93 percent of the coal mined in the United States each year is used to make electricity.
In 2015, $7.6 billion worth of gold was mined in more than 45 locations across the United States. About 40 percent of the gold in the world today came from the Witwatersrand basin in South Africa.
Oil has been produced in 31 states in the United States and in the waters off its coasts. Approximately 17 percent of U.S. oil is produced by offshore oil wells.
