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I believe that the answer is A.
Gneiss. It is a high grade metamorphic rock, having been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of granite, or sedimentary rock.
The most significant advantage of using renewable energy sources is that is sustainable (as a result of the fact that is renewable) and the low Greenhouse Gas Emissions.Renewable energy sources do not pollute the environment it with Co2 and other toxic gases that are produced by fossil fuels.
The answer for "What is petrified wood made of?" would be minerals.
