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up vote 6 down vote favorite Atmospheric pressure increases the deeper you go & the highest growing plants on Earth have been found at a height of 6 km so how deep a trench would we need on Mars to provide similar air pressure? World’s highest plants discovered growing 6km above sea level mars colonization atmosphere terraforming plants share | improve this question edited Dec 2 at 10:14 asked Dec 2 at 1:14 Pelinore 201 7