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VOLCANOES 1. How do volcanoes form? Volcanoes form from heat within the earth’s crust. For some unknown reason, sometimes this heat can melt through rocks, and these rise to the earth’s surface quickly. When these hot rocks and gasses break though the earth’s surface, an eruption takes place. 2. How long does it take for plants go grow back on a volcano? It depends on how much rainfall the volcano site receives. For example on the sunny side of Hawaii, volcano’s that are 2 years old have ferns and small trees growing on them, and in 10 years may have a small forest growing on it. On the dry side of Hawaii, 200 y