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