The atmosphere is made up of 4 distinct layers: the troposphere, stratosphere, mesosphere, and thermosphere. Different types of clouds form in the different layers depending on the pressure in the atmosphere and the ambient temperature. The cloud types include nimbus, stratus, cumulus, and cirrus. Figure 1 shows the location of the barriers of the atmosphere when the temperature and pressure are at an ideal condition for cloud formation. It also shows the different types of clouds formed at the different levels. Note: Clouds are formed mostly of water crystals, but can also contain particles of rock and dust.According to figure 1, the atmospheric layer with the greatest range in pressure is the

Correct answer: B. Thermosphere

A. Mesosphere
B. Thermosphere
C. Stratosphere
D. Troposphere

Explanation

By looking at Figure 1, you can determine the range in pressure at which each atmospheric layer can exist. Beginning with answer choice a, calculate the difference between the lowest pressure and the highest pressure at which the atmospheric layer can exist: Mesosphere: 14.5 psi − 7.5 psi = 7 psi Thermosphere: 17.8 psi − 10.3 psi = 7.5 psi Stratosphere: 9.5 psi − 3.8 psi = 5.7 psi Troposphere: 5.0 psi − 1.0 psi = 4.0 psi The pressure in the thermosphere has the greatest range, answer choice B.

Last updated 3 September 2026

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