Time4Learning offers an interactive online science curriculum as part of its online education program. The materials are presented using a combination of multimedia lessons, instructional videos, printable worksheets, quizzes, tests and both online and offline projects.
 Coal is formed from plant life buried in the Earth millions of years ago. Like Petroleum and natural gas, it is a carbon-based fossil fuel.  Coal is called a fossil fuel b â¦ ecause it was formed from the remains of vegetation that grew as long ago as 400 million years.
Coal takes millions of years to form. Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons. Coal is classified as a nonrenewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests. The plants were covered by layers of dirt and rock over millions of years.