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 is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure.