Fuel Types and Uses Crossword Puzzle

QUESTIONS LIST:

• fifty: maximum number of years until we run out of oil
• tar sands: what crude oil is recovered from (2 words)
• methane: what natural gas is mostly comprised of
• sulfur: smelly nonmetal that releases when petroleum is burned
• developing: types of countries that commonly use wood for fuel
• anthracite: type of coal also known as "hard coal"
• phytoplankton: the remains of these form petroleum
• charcoal: one of the most common uses for wood in fuel
• co generation: term for generating heat and electricity from fossil fuels
• refineries: places (plural) that produce fuels from oil sands
• lignite: type of coal with the smallest % of carbon
• peat: precursor to coal