Answer:

altitude (height of an object in relation to sea level or ground level)

exosphere: is the uppermost region of the Earth's atmosphere and has no clear upper boundary since it gradually fades into outer space. The exosphere is the uppermost region of Earth's atmosphere as it gradually fades into the vacuum of space.

thermosphere: The thermosphere is a layer of Earth's atmosphere that is directly above the mesosphere and below the exosphere. It extends from about 90 km (56 miles) to between 500 and 1,000 km (311 to 621 miles) above our planet.

mesosphere: The mesosphere is a layer of Earth's atmosphere.The mesosphere is directly above the stratosphere and below the thermosphere. It extends from about 50 to 85 km (31 to 53 miles) above our planet. Temperature decreases with height throughout the mesosphere.

stratosphere: The stratosphere is a layer of Earth's atmosphere. It is the second layer of the atmosphere as you go upward. The troposphere, the lowest layer, is right below the stratosphere. The next higher layer above the stratosphere is the mesosphere.

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