flows are masses of molten rock that pour onto the Earth's surface during an effusive eruption
. Both moving lava
and the resulting solidified deposit are referred to as lava flows. Because of the wide range in (1) viscosity of the different lava types (basalt
, and rhyolite
); (2) lava discharge during eruptions; and (3) characteristics of the erupting vent
and topography over which lava travels, lava flows come in a great variety of shapes and sizes.