Volcanic Bomb

A volcanic bomb, a mass of molten rock larger than 64 mm in diameter, is formed when a volcano ejects viscous fragments of lava during an eruption, generally in the shape of breads, pears, spindles and twisted ropes. During a volcanic explosion, lava fragments are ejected into the air. Before fully solidifying, the fragments spun in the air and shaped a certain degree of roundness. Volcanic bombs usually fall near a volcanic crater. Therefore, seeing a volcanic bomb means that you have close to the crater. The diameter of a volcanic bomb is generally 8-20 cm and the lager one is 50-90 cm (around Crater No.Ⅲ and No.Ⅳ).