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Volcanoes — Geography STD 9 — Question

ICSE BoardEnglish MediumSTD 9GeographyVolcanoes3 Marks
Question
Describe the materials thrown out during volcanic eruption.
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Answer

The materials thrown out of a volcano due to eruptions are of three types :
  1. Solid materials:- The solid materials include large fragments of rocks known as volcanic Bombs. The finest particles include cinder volcanic ash dust.
  2. Liquid materials:- The liquid materials include basic lava and Acid lava. Acid lava has more silica while Basic lava has a low content of Silica.
  3. Gaseous materials:- The gaseous material is mainly composed of steam. The other gases include Oxygen Hydrogen Sulphuric acid Carbon dioxide etc.

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