Layer where the atmosphere thins out and merges with interplanetary space is called ______________.

Mesosphere

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Ionosphere

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Troposphere

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Exosphere

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Solution

The correct option is B Exosphere
Layer where the atmosphere thins out and merges with interplanetary space is called exosphere. Exosphere is the outermost layer of the Earth's atmosphere. It extends from about 600 km until it thins out to merge with interplanetary space. Due to this, exosphere is about 10,000 km or 6,200 miles thick or about as wide as the Earth. The top boundary of Earth's exosphere extends about halfway to the Moon.

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