The ash, dust, gases, and lava released by volcanic explosion. The gases are volatile matter composed principally of about 90% water vapor, and carbon dioxide, sulfur dioxide, hydrogen, carbon monoxide, and nitrogen. The ash or dust is pyroclastic ejecta and lava is molten extrusive material consisting mainly of magnesium silicate. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Annotation

specify geographic term if pertinent

je-li třeba, upřesni zeměpisně

DUI

D018707 MeSH Browser

CUI

M0028020

Previous indexing

Air Pollutants, Environmental (1982-1994); Geology (1966-1979); Natural Disasters (1982-1994)

History note

2009 (1995); use NATURAL DISASTERS 1982-1994

Public note

2009; see VOLCANIC ERUPTION 1995-2008, see NATURAL DISASTERS 1982-1994