Hakkoda volcano is a group of 14 stratovolcanoes and lava domes south of Mutsu Bay at the northern end of Honshu Island, Japan.
There are fumaroles and hot springs at Ido-dake and several other locations. 3 minor phreatic eruptions were documented from Jigoku-numa on the SW flank of Odake volcano from the 13th-17th centuries.
Igneous or magmatic rocks: The most primitive rock type forms when magma (molten rock) solidifies - either inside the earth (plutonic rocks) or during volcanic eruptions (volcanic rocks). A short overview.
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