The answer of woorsheet

1-Fuel is any material that is altered in order to obtain energy.
2-Fossil fuels or mineral fuels are fossil source fuels, that is, coat or hydrocarbons found in the earth's crust.
3-The fossil fuel contributes to the enhanced greenhouse effect and global warming.
4-Renewable energies: they are those sources of energy that one obtains of natural sources(fountains) virtually inexhaustibly (for the immense quantity of energy that it(he,she) contains, and other one because they are capable of being regenerated by natural means)
5-Not renewable energies: they are those sources of energy that they find in the nature, in a limited quantity (and that once consumed in its entirety, cannot be replaced, since system does not exist of produccióno viable extraction, or the production from other sources(fountains) is too small as(like) to turn out to be useful short-term)
6-Hydropower and solar energy.
7-Fossil fuels and nuclear energy.
9-Nuclear energy es the energy of the atomic nucleus of heavy elements like uranium