What caused the transitions from explosive to effusive volcanism in the Circum-Hellas Volcanic Province generally and during the eruptive lifetimes of individual highland patera volcanoes?
Source: wiktionary
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What caused the transitions from explosive to effusive volcanism in the Circum-Hellas Volcanic Province generally and during the eruptive lifetimes of individual highland patera volcanoes?
Source: wiktionary
Note that the eroded plains materials to the right of the patera show no signs of individual lava flows.
Source: wiktionary