The population is less in the mountains, Why ?
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Explanation:
- Mountain regions are sparsely populated because of cold climate and less vegetation. People can not survive in such a harsh climate. River valley are thickly populated because they have enough water and trees for the survival of people.
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Atoms are the building blocks of all matter. When a substance contains only one type of atom, it is called an element. ... An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.
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