Question

IV. Long Answer Type Questions
1. Give a brief account on different types of rocks.​

Answer 1

Answer:

There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water.31-Aug-2018

Explanation:

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Answer 2

Answer:

There are three types of rocks on the basis of their formation:

• Igneous, • Sedimentary, and • Metamorphic

brief description of these:-

Igneous rocks

• formed by solidification of molten material.

• known as parent rock.

• is of two types: extrusive and intrusive

• Example: granite

Sedimentary Rocks

• formed by deposition of sediments one over other.

• also known as stratified or secondary rocks.

• is of three types: mechanically formed, chemically formed and organically formed.

• fossils are found in these rocks.

• Example: coal

Metamorphic Rocks

• formed by high temperature and pressure

• alters the properties of igneous and sedimentary rocks.

• Example: slate