Final answer:
The exosphere is Earth's outermost atmospheric layer, acting as the boundary between Earth and outer space, crucial for energy exchanges.
Explanation:
The outermost layer of the Earth's atmosphere is the exosphere. This layer is the boundary of Earth and gradually thins out into space, without a specific boundary like other layers.
The exosphere is part of the five main layers of Earth's atmosphere: troposphere, stratosphere, mesosphere, thermosphere, and exosphere. It is where the atmosphere meets outer space.The exosphere plays a key role in the Earth system as the outer limit where energy exchanges with space occur.
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