phreatic high
1phreatic eruption — ALASKA VOLCANO OBSERVATORY GLOSSARY An explosive volcanic eruption caused when water and heated volcanic rocks interact to produce a violent expulsion of steam and pulverized rocks. Magma is not involved. GLOSSARY OF VOLCANIC TERMS A steam… …
2phreatic — adjective Etymology: Greek phreat , phrear well; akin to Armenian ałbiwr spring, Old High German brunno more at burn Date: circa 1890 1. of, relating to, or being groundwater 2. of, relating to, or being an explosion caused by steam derived from… …
3Aquifer — Typical aquifer cross section An aquifer is a wet underground layer of water bearing permeable rock or unconsolidated materials (gravel, sand, or silt) from which groundwater can be usefully extracted using a water well. The study of water flow… …
4Pacific Ring of Fire — The Ring of Fire redirects here. For other uses of the term, see Ring of Fire (disambiguation). The Pacific Ring of Fire (see below) …
5David A. Johnston — David A. Johnston, 13 hours before his death at the 1980 eruption of Mount St. Helens Born …
6Cerro Negro — on August 20, 2011 Elevation …
7Types of volcanic eruptions — In this article types of eruption will be used to refer to the mechanism causing the eruption. The style of eruption will be used to describe subcategories of eruption, which have the same eruptive mechanism. For example strombolian and vulcanian …
8Chad Basin — The Chad Basin, also known as the Lake Chad Basin, is a large lowland area in north central Africa. In all directions from the center of this area the elevation changes are gentle. The Chad Basin is an endorheic (closed) basin its water does not… …
91980 eruption of Mount St. Helens — Photograph of the eruption column, May 18, 1980 Volcano Mount St. Helens …
10Magma — For other uses, see Magma (disambiguation). Lava flow on Hawaii. Lava is the extrusive equivalent of magma. Magma (from Greek μάγμα paste ) is a mixture of molten rock, volatiles and solids[1] …
