science

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Across
  1. 4. is the use of falling or fast-running water to produce electricity or to power machines.
  2. 7. A non-renewable resource is a natural substance that is not replenished with the speed at which it is consumed
  3. 8. a machine for producing continuous power in which a wheel or rotor
  4. 10. Relating to a natural resource, such as solar energy, water, or wood,
  5. 12. a source of help in a situation
  6. 13. relating to or determined by the sun.
Down
  1. 1. the perceptible natural movement of the air, especially in the form of a current of air blowing from a particular direction.
  2. 2. a combustible black or dark brown rock consisting chiefly of carbonized plant matter, found mainly in underground seams, and used as fuel.
  3. 3. relating to or produced by the internal heat of the earth.
  4. 5. a form of energy resulting from the existence of charged particles
  5. 6. relating to the nucleus of an atom.
  6. 9. a liquid mixture of hydrocarbons which is present in suitable rock strata and can be extracted and refined to produce fuels including petrol
  7. 11. the total quantity or weight of organisms in each area or volume.