VOLCANOES

VOLCANOES :-

A Volcano is a vent or an opening in the earth's crust through which hot materials come forth from deep below the surface. The opening is usually circular in form. Sometimes a volcano has only one opening at the summit, often there are other openings in the sides of the mound. Volcanic eruptions may also take place through a long crack or fissure through which steam and other materials escape. Volcanoes are grouped according to their stages, either as active, dormant· or extinct. These names refer to the state of activity rather than the types of volcanoes. While active volcanoes erupt periodically, dormant volcanoes show no sign of activity for many years but may become active any time, extinct volcanoes are no longer active.

PRINCIPAL ACTIVE VOLCANOES

Name Height (Meters) Location Country Date of last notified eruption
Ojos del Saldao 6885 Andes Argentina-Chile 1981
Guallatiri 6060 Andes Chile 1660
Cotopaxi 5897 Andes Equador 1975
Tupungatito 5640 Andes Chile 1964
Lascar 5641 Andes Chile 1968
Popocatepeti 5451 Altiplano de Maxico Mexico 1920
Nevado del ruiz 5400 Andes Colombia 1985
Sangay 5230 Andes Equador 1976
Klyuchevaskaya 4850 Sredinnyy Khrebet Erstwhile USSR 1974