GEOLOGY & PLANETARY SCIENCE A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z           HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site effusive eruption Basalt lava erupts from Pu'u 'O'o spatter and cinder cone at Kilauea Volcano, Hawai'i. Lava spilling from the cone has formed a series of a'a lava channels and flows. Credit: J. D. Griggs / U.S. Geological Survey An eruption dominated by the outpouring of lava onto the ground. Lava flows generated by effusive eruptions vary in shape, thickness, length, and width depending on the type of lava erupted, discharge, slope of the ground over which the lava travels, and duration of eruption. An effusive eruption is distinct from the violent fragmentation of magma by an explosive eruption. For example, basalt lava may become a'a or pahohoe, and flow in deep narrow channels or in thin wide sheets. Andesite lava typically forms thick stubby flows, and dacite lava often forms steep-sided mounds called lava domes. Related category    • GEOLOGY AND PLANETARY SCIENCE Source: U.S. Geological Survey Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP