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Three Types of Rocks Video for Kids

 

                                                   Types of Rocks

A rock can be defined as a solid mass that occurs naturally as a part of our planet or a specific assemblage of minerals. They come in various different colours, shape and size. No two of them are exactly alike. They exist in three fundamentally different forms: – Igneous, Sedimentary and Metamorphic.

  • Igneous Rocks: – Igneous rocks are formed when molten rock, known as magma is cooled and solidified. These rocks are crystalline solids. Sometimes the magma cools inside the earth and sometimes it erupts from a volcano. If the lava cools quickly then no crystals are formed and it will result in formation of a shiny and glasslike rock. Igneous rocks formed at the surface of the earth is known as extrusive rock and rocks that are formed before reaching the surface are known as intrusive rocks. Basalt and Obsidian are examples of igneous rocks.
  • Sedimentary Rocks: – These rocks are formed at the surface of the earth either on land or in water. They are formed from particles of sand, pebbles and other fragments of material. Altogether these particles are known as sediments. These sediments build layers by combining. These rocks are soft and can be broken apart quite easily. Sedimentary rocks are secondary as they are formed when small pieces of pre-existing rocks gather up together. Limestone and conglomerate are examples of sedimentary rocks.
  • Metamorphic Rocks: – When a sedimentary or igneous rock is brought under high pressure or heat then it is completely changed. In this changed state, it is known as metamorphic rocks. A rock is required to be moved into an environment in which the rock making minerals become unstable and out of equilibrium. Slate and gneiss are examples of metamorphic rocks.
 

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