Educational video for children to learn what rocks are, what they are made up from and how we classify them. On the basis of their origin, rocks can be classified as igneous, sedimentary and metamorphic. Rocks can also be classified based on their hardness. There are hard rocks, soft rocks and liquid rocks. Children will look at examples for each one of these groups. They will also discover in what ways rocks have been used since prehistoric times. This video belongs to a collection of Science videos for children and is an excellent resource for elementary school.

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