Subduction zone.....This is usually an oceanic plate being subducted beneath a contenental plate as oceanic is less dense.
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D. Europeans wanted new places to sell finished products and industrial goods.
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Explanation: The only real solution is to have a large automated labor force moving materials from Venus to Mars to make Mars large enough to kick start it's own magnetosphere and natural life cycle processes. The solar winds could potentially be harnessed to travel back and forth while stripping materials from Venus to Mars.
