blocks — GLOSSARY OF VOLCANIC TERMS Fragments of solid rock greater than 64 millimeters in diameter that are ejected during volcanic eruptions. Blocks are commonly composed of accessory fragments made up of crystallized magma associated with the eruption… … Glossary of volcanic terms
Non-volcanic passive margins — (NVPM) constitute one end member of the transitional crustal types that lie beneath passive continental margins; the other end member being volcanic passive margins (VPM). Transitional crust welds continental crust to oceanic crust along the… … Wikipedia
Mount Edziza volcanic complex — Mount Edziza, one of the main volcanoes of the Mount Edziza volcanic complex Elevation … Wikipedia
Geology of the Lassen volcanic area — The geology of the Lassen volcanic area presents a record of sedimentation and volcanic activity in the area in and around Lassen Volcanic National Park in Northern California, U.S.. The park is located in the southernmost part of the Cascade… … Wikipedia
North Island Volcanic Plateau — View of the Central Plateau from the Desert Road showing the three active peaks: Snow capped Ruapehu (left), conical Ngauruhoe (centre) and broad domed Tongariro (right) The North Island Volcanic Plateau (often called the Central Plateau and… … Wikipedia
volcano — /vol kay noh/, n., pl. volcanoes, volcanos. 1. a vent in the earth s crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals. 2. a mountain or hill, usually having a cuplike crater at the summit,… … Universalium
Agglomerate — Agglomerates (from the Latin agglomerare meaning to form into a ball ) are coarse accumulations of large blocks of volcanic material that contain at least 75% bombs. Volcanic bombs differ from volcanic blocks in that their shape records fluidal… … Wikipedia
Milbanke Sound Group — Milbanke Sound Cones Mountain … Wikipedia
Tephra — is air fall material produced by a volcanic eruption regardless of composition or fragment size. [This is the broad definition of tephra (Greek tephra , ash ) proposed by the Icelandic volcanologist Sigurdur Thorarinsson in 1954, in connection… … Wikipedia
Pyroclastic fall — A pyroclastic fall is a uniform deposit of material which has been ejected from an eruption or plume such as an ash fall or tuff. Pyroclastic flows occur relatively spontaneously in the geological time scale and are great indicators of time.… … Wikipedia
