fuel for vehicles

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Across
  1. 2. (7 letters): An eco-friendly fuel made from plants.
  2. 5. (11 letters): A fuel derived from ethanol or methanol used in vehicles.
  3. 6. (3 letters): This fuel is used in airplanes.
  4. 7. (16 letters): A hydrogen-based fuel used in fuel cells for clean energy.
Down
  1. 1. (4 letters): This fuel is made from the remains of dead plants and animals.
  2. 3. (8 letters): A clean fuel used in electric vehicles.
  3. 4. (5 letters): An energy source that comes from the sun.