A lava flow is an outpouring of lava during an effusive eruption.. Learn about the types of lava including the forms of lava flow (pahoehoe and a'a) and the chemical composition based on silica content.
(an explosive eruption, by contrast,.. Learn about lava, the molten rock that erupts from volcanoes and its types, formation process, and the transformative impact it has on earth's surface and ecosystems.