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1.Type of energy resource that will never run out - 6 letters

2.Type of energy resource that will never run out - 9 letters

4.Using the Sun’s energy to heat water - 5 letters

Across
3.Ethanol is an example of this type of fuel - 7 letters

5.The burning of these fuels releases carbon dioxide - 6 letters

6.Burning trees is described as carbon ... - 7 letters

7.Damming rivers to generate electricity - 5 letters

8.The energy comes from splitting atoms - 7 letters

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -