Name: Types of rocks
Uploaded: 2019-07-19
Duration: 5 min 19 s
Description: In this video students will get to know how rocks slowly change from one kind to another through a series of natural processes.

Question

How many types of rocks are there? How are they formed?

Accepted Answer

There are three main types of rocks: igneous, sedimentary, and metamorphic.

Igneous rocks are formed from cooled magma or lava. They can be intrusive (large crystals) or extrusive (small crystals or glass). Examples: granite, basalt.

Sedimentary rocks are formed from accumulated sediments. They can be clastic (pieces of other rocks), chemical (minerals from water), or organic (remains of living things). Examples: sandstone, limestone.

Metamorphic rocks are formed from changed existing rocks. They can be foliated (layered or banded) or non-foliated (uniform or granular). Examples: slate, marble.

Each type of rock provides clues about the Earth's history and processes. Understanding them helps scientists unravel the story of our planet's evolution.

How many types of rocks are there? How are they formed?

Important Questions on The Structure Of The Earth

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