Question

__ become popular in northern regions of Europe.​

Answer 1

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Some northern European countries such as Denmark have some reserves of petroleum and natural gas. Germany has large coal reserves, as well as nickel and lignite (or brown coal, similar to peat).

Answer 2

Answer:

Some northern European countries such as Denmark have some reserves of petroleum and natural gas. Germany has large coal reserves, as well as nickel and lignite (or brown coal, similar to peat)