I think the answer is Salinization
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Your question: What physical feature marks the eastern boundary of the cultural subregion known as European Russia..?
Your answer: The Ural Mountains physical feature marks the Eastern boundary o f the cultural subregion known as European Russia.
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Of these choices i'd say that the third option or "domestic fuels are always cheaper to acquire and renewable". I hope this helps :)
Answer:By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides can also be emitted from volcanoes
Explanation:
