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.
And The Legend Of The Vampire and Scooby-Doo! and the Monster of Mexico before leaving for good. Kellie Martin voiced the junior-high school aged Daphne in A Pup Named Scooby-Doo from 1988 until 1991. Recent voice actresses have included the late Mary Kay Bergman (1998-2000) and Grey DeLisle (2001-current).