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Shale
Shale is a softer sedimentary rock. It is formed from mud that settles to the

bottom of an ocean or lake. Shale is found in different colours. Brown, red and
grey are some common colours of shale.

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The diamond is the hardest natural substance found on the Earth.

Metamorphic RocksRocksRocks
Metamorphic
Metamorphic
Heat and pressure below the surface of the Earth
can bring about changes in the minerals of igneous

and sedimentary rocks which transform into new
kinds of rocks. This process is called metamorphosis

which means changes. Sedimentary rocks are made
under the seas. Sometimes, a sea gets dried up. Metamorphic Rocks

Sedimentary rocks are exposed to wind and rain. In course of time, a new kind

of rock is formed. These are nothing but metamorphic rocks which are hard
and tough in nature.

Types of Metamorphic Rocks
Slate
Slate is a metamorphic rock formed from shale.

Slate is harder than shale. It is commonly used
to make slates and blackboards. It is shiny and

Slate dark grey in colour.

Marble Qyartizite Gneiss

Marble
Marble is a metamorphic rock formed from limestone. Marble is often found in
different colours. It is used in the construction of buildings. World-wide

famous Taj Mahal was built with white marble stone.

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