explain three types of volcanoes on the basis of the frequency of eruption 40 words.
Answers
(i) Active Volcanoes:
Volcanoes, from whose vents there is constant emission of volcanic materials such as, lava, ashes, lapilli, pumice and gases etc. are called active volcanaoes. Some of the active volcanoes are continually in eruption, while in other cases the eruptions are intermittent.
A few examples of active volcanoes are: Etna and Visuvius, Mount Pelee (Martinique), Mount Karmai (Alaska), Mount Saint Helens, Nevado Del Ru'z (Columbia), Mount Unzen (Japan), Mount Pinatubo (Philippines), Mount Redoubt (Alaska) and Mount Mayon (Philippines).
(ii) Dormant Volcanoes:
There are certain volcanoes which do not show any sign of volcanic activity for a long time. They are in a state of slumber. They appear to be extinct.
But all of a sudden there is explosive eruption with the result that there is unimaginable loss of life and property. Such volcanoes are said to be of the dormant type. The Vesuvius volcano is a typical example of a dormant volcano.
(iii)Extinct Volcanoes:
This is an extreme case when a volcano permanently stops its volcanic activity. Even though the cone and its crater may still be present, it no longer emits steam.
Examples may be given of the volcanoes of the Eiffel district of Western Germany; of the Auvergne in central France; and of a host of volcanoes in Western United States.