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Natural Disasters — [Old] Social science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8[Old] Social scienceNatural Disasters4 Marks
Question
Write short notes : Composition of a Volcano.
✓

Answer

Due to internal pressure there is a lot of movement within the molten lava situated in the interior of the Earth.
  • The temperatur of water which has percolated into the upper layers of the soil rises , and the water eventually turns into water vapour.
  • Water vapour requires much more space than water .
  • So it exerts tremendous pressure in all directions.
  • Due to this, the weaker section of the Earth’s crust break with big sound and create fissures .
  • First of all, water vapour is thrown out throught these fissures.
  • It is followed by ash, rock fragments, mud and then the hot magma.
  • This magma spreads in all directions and forms a cone shaped hill or a mountain.
  • Such a mountain is called a volcano.”
  • This is how a volcano is formed.
  • There are three types of volcanoes :
  • $(1)$ Active volcano, $(2)$ Dormant (latent) volcano and $(3)$ Extinct(dead) volcano.

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