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The organisms occupying the base of a pyramid of energy are autotrophs .
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Volcanic Vents
Openings in the Earth's crust from which molten rock, gases, and ash are ejected or emitted.
Volcanic Domes
Rounded, bulbous formations of viscous lava that are created by slow eruptions and accumulate around a volcano's vent.
Pyroclastic Flows
Pyroclastic flows are fast-moving currents of hot gas and volcanic materials that flow down the sides of a volcano during an explosive eruption.
Volcanic Domes
Lava domes are rounded, steep-sided mounds formed from the slow extrusion of viscous lava from a volcano.
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