Shiga volcano is a group of small andesitic shield volcanoes and pyroclastic cones immediately north of Kusatsu-Shirane volcano.
The last eruptions were about 250,000 and 10,000 years ago. The complex was built on top of a large lava plateau that was erupted between about 300,000 to 200,000 years ago.
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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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