renewable,non-renewable,abundant,alternative,polluting,
exhaustible , fossil,available
1. Many of the earth's natural resources are............,which means they are available in limited quantity and can be used up.
2 Oil is a relatively............... buut is a non-rewable resource.
3. .................... fuels, including coal, oil and natural gas, are currently the world's primary energy source.
4.............. resources are those which cannot be replaced once they are used up
5................... energy is any energy source that can replaced fossil fuel.
6. Despite being the most .................... source, coal still plays an important rola in the production of electricity.
7. Solar power from the sun is .............. as we won't " use up " all the sunlight from the sun
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