Tens of millions of years.   Coal is a fossil fuel created from the remains of plants that lived  and died about 100 to 400 million years ago when parts of the earth  we â¦ re covered with huge swampy forests. Coal is classified as a  nonrenewable energy source because it takes millions of years to  form.
New Scooby episodes, in the original Scooby-Doo, Where Are You! format, were produced for each of these three seasons. Four of these episodes featured Scooby's dim-witted country cousin, Scooby-Dum, as a semi-regular character.
According to the original series bible from 1969 by Scooby-Doo, Where are You! creators Joe Ruby and Ken Spears (who later left Hanna-Barbera to build their own Saturday morning empire), the kids are all supposed to be high school juniors: Fred and Shaggy are 17, Daphne is 16, and Velma is 15. Scooby, the dog, is 7.