Volcanic Cone

Science / Geology / Volcanic Cone: A cone-shaped hill or mountain composed of pyroclastic debris and/or lava which builds up around a volcanic vent during eruptions.

Volcanic Bomb

Science / Geology / Volcanic Bomb: A projectile of hot magma or rock that is blown from the vent during a volcanic eruption. These solidify in flight and frequently form an elongated rock of streamlined shape. MORE

Volcanic Breccia

Science / Geology / Volcanic Breccia: A rock made up of pyroclastic fragments that are at least 64 millimeters in diameter. MORE

Volcanic Block

Science / Geology / Volcanic Block: A pyroclastic rock fragment ranging from about fist- to car-sized. MORE

Volcanic Ash Flow

Science / Geology / Volcanic Ash Flow: A mixture of volcanic ash and gases that moves downhill as a density current in the atmosphere. MORE

Volcanic Ash Fall

Science / Geology / Volcanic Ash Fall: An accumulation of volcanic ash produced by an eruption. These can be very thick near the vent and decrease to a light dusting in a downwind direction. MORE

Volcanic Cone

Science / Geology / Volcanic Cone: A cone-shaped hill or mountain composed of pyroclastic debris and/or lava which builds up around a volcanic vent during eruptions. MORE

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