Erupcje wulkaniczne - formy i produkty

A volcano is an opening in the Earth's surface where eruptions can take place and lava flows, pyroclastic material and volcanic gases escape from a magma reservoir. Volcanoes can be classified as effusive, explosive or composite (stratovolcanoes). The explosivity of eruption depends on the chemical composition, viscosity and volatile content of the magma. Most magmas are silicate melts; after degassing during eruption, they are termed lavas. The explosivity of an eruption depends mainly on the content of juvenile water in the magma (magmatic eruption), and on the extent of interaction of extruded magma with surface water (phreatic eruption). The products of effusive eruption are lava flows and lava domes; for explosive eruption they are mainly bombs, lapilli and ashes.