Explain two reasons why an unconventional source of energy extraction can lead to social and environmental problems.

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What is the mercury length of time for one revolution around the sun?

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted