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Are all volcanoes made of lava?
source link: https://www.programmerinterview.com/science-questions/are-all-volcanoes-made-of-lava/
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Are all volcanoes made of lava?
No. Actually, there are many volcanoes that are made only of ash. But, there are also some volcanoes that are made of alternating layers of both lava and ash.
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