1. erupting or tending to erupt; "a geyser is an intermittently eruptive hot spring"

2. igneous rock produced by eruption and solidified on or near the earth''s surface; rhyolite or andesite or basalt; "volcanic rock includes the volcanic glass obsidian"

3. of igneous rock that has solidified beneath the earth''s surface; granite or diorite or gabbro

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