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ICSE Class 7 Geography Question 1 of 21

Weathering and Soil Formation — Question 1

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Question 1

What are rocks? Name the main types of rocks with two examples of each.

Answer

Rocks are aggregates of one or more minerals, without having a definite chemical composition. The rocks may be composed of hard materials like granite and marble or soft like chalk, clay and sand.

The main types of rocks are:

  1. Igneous rocks or Primary rocks:
    1. Intrusive igneous rocks — For example, granite and dolerite
    2. Extrusive igneous rocks — For example, basalt, pumice
  2. Sedimentary rocks — For example, sandstone and limestone
  3. Metamorphic rocks — For example, marble and quartzite