DR FRED ESPENAK / SCIENCE PHOTO LIBRARY DR FRED ESPENAK / SCIENCE PHOTO LIBRARY
Cinder cones seen on the flanks of Mauna Kea volcano, Hawaii. Cinder cones develop around the vents, orifices through which molten material erupts, of a volcano. They are formed by particles which exceed 4mm in diameter; the larger fragments are known as lapilli (5-10mm) or scoriae.
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