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The troposphere is the first layer of atmosphere. Troposphere consist half of the atmosphere. Weather even occurs in this layer. Hope it helped :).
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The Troposphere
 It is the lowest layer of the atmosphere and begins at the surface and extends to between 7 km (23,000 ft) at the poles and 17 km (56,000 ft) at the equator.

Hope this may helps uu..............

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