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Inside Our Earth — Social Studies STD 7 — Question

CBSE BoardEnglish MediumSTD 7Social StudiesInside Our Earth5 Marks
Question
Define the following?
  1. Igneous rocks.
  2. Sedimentary rocks.
  3. Metamorphic rocks.
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Answer

  1. Igneous rocks: Igneous rocks are formed by the solidification of hot and molten magma, also termed as primary rocks or the parent rocks.
  2. Sedimentary rocks: Sedimentary rocks are formed the sediments, particles, grains or fragments derived from existing primary rocks. These sediments are soft but in course of time they become hard and compact.
  3. Metamorphic rocks: Because of tremendous pressure and high temperature both igneous and sedimentary rocks may be altered so greatly in appearance and composition that they entirely lose their original character. They are termed as metamorphic rocks.

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