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Inside Our Earth — Social Studies STD 7 — Question

CBSE BoardEnglish MediumSTD 7Social StudiesInside Our Earth5 Marks
Question
Describe igneous rocks.
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Answer

Igneous Rocks:
  • The molten rock material is called magma.
  • When it cools, it becomes solid.
  • Rocks formed in this way are called igneous rocks.
  • They are also called primary rocks because other rocks are formed out of these rocks.
There are two types of igneous rocks:
  • Intrusive Rocks and
  • Extrusive Rocks
Formation of Extrusive and Intrusive Rocks:
  • Due to extreme heat in the interior of the earth, rocks are found in the form of molten material called magma.
  • When magma comes out on the surface of the earth, it cools down and turns into solid rocks. Such rocks are termed as extrusive rocks.
Examples:
  • Basalt.
  • Deccan Trap is built of basalt.
When the molten magma cools down within the interior of the earth, it becomes solid to form intrusive rocks.
Examples:
  • Granite.
  • Garbo.

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