Ancient volcanic eruptions that buried this area in ash turned these tree trunks into stone.
WORDWISE caldera: a large volcanic crater
convection current: a transfer of Earth’s heat caused by a circular pattern of hotter fl uid rising and cooler fl uid sinking
geothermal: something that uses the heat from Earth’s interior
hydrothermal: something that is related to hot water
magma: hot, mostly molten rock inside Earth that is melted by the heat in Earth’s interior
magma chamber: a large pool of magma under the ground
Over time, acid in this hot spring breaks rock down into milky clay, forming a bubbling mud pot.
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