. Rarely has fossils
. May react with acid
. Classified by texture and composition
Answer:
natural gas from fracking
Explanation:
Biomass fuel is made from organic material. Natural gas is not considered a source of biomass fuel, as it itself is fuel.
The factors that contributed to the environmental problems which exist in Europe was that B. Much of Europe is densely populated.
I want to say the answer is Tribalism.
Please know i am not CERTAIN this is the answer, but it is similar to a question i had. (Tribalism was the answer)