# Rock Cycle

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There are three main classes or types of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when magma cools and hardens. Sedimentary rocks are made of particles of materials such as shells, sand, and pebbles. Metamorphic rocks form under the surface of the earth as a result of intense pressure and heat. Sedimentary rocks are made of sand, shells, pebbles, and other particles, and they often crumble easily. Igneous and metamorphic rocks are both much harder and more difficult to break.

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### Help

The correct answer is

##### Remember :

The smallest number is the one that comes first while counting.

##### Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.