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eBook details

• Title: Wonders of Creation
• Author : Anonymous
• Release Date : January 08, 2017
• Genre: Education,Books,Professional & Technical,
• Pages : * pages
• Size : 1452 KB

Description

The most essential part of a volcano is the crater, a hollow basin , generally of a circular form. It is often of large dimensions, and sometimes of vast depth. Some volcanoes consist of a crater alone , with scarcely any mountain at all; but in the majority of cases the crater is situated on the top of a mountain, which in some instances towers to an enormous height. The part of the mountain which terminates in the principal crater is usually of a conical form much like a glass house chimney, and is therefore named the cone. It is generally composed of loose ashes and cinders, with here and there masses of stone, which have been tossed into the air by the volcanic forces. In some mountains the cone rises out of a hollow at a considerable height from the base. A hollow of this kind is generally regarded as having been a former crater, which had become extinct before the existing cone was raised. There are sometimes formed lower down the mountain subordinate craters , smaller than that which occupies the summit of the cone. Within the crater itself there are frequently numerous little cones, from which vapours are continually issuing, with occasional volleys of ashes and stones.

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