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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.
Volcano & eruption special tours Tours dedicated to usually a single volcano currently in eruption. These trip, sometimes offered only last-minute through our newsletter, are among the most adventurous and most popular in our program.
Divergent plate boundaries in oceans Two ocean plates move apart from each other. Hot upwelling mantle material forms magmas that continuously produce new oceanic crust. An ocean widens.