Why are two plates spreading considered to be 'constructive'?

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asked Nov 21, 2017 123k views

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Wouter Verlaek · Answer 1 · 2017-11-26T10:32:21+0000

When two tectonic plates move apart, molten lava rises up to fill the gap left by the two plates moving apart. This lava cools forming new crust, thus this is "contructive."

Why are two plates spreading considered to be 'constructive'?

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