.The only active volcano in the world that exists below sea level is?

Active Volcano Found Under Antarctic Ice: Eruption Could Raise Sea Levels. The summit of Mount Erebus casts a long shadow out over the Ross Sea. Mount Erebus is the most active volcano in Antarctica—and one of a few in the world with a permanent lake of molten lava in its crater.

Explanation:

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the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.