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 the information given in figure 1, clouds within the stratosphere are most likely formed

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Under a pressure of 10 psi and 30 degree C. Answering this question requires you to look carefully at the range of temperature and pressure combinations at which clouds in the stratosphere form, as shown in Figure 1. Because the clouds here begin to form under 30◦ C and most are located below a pressure of 10 psi, this combination is correct. The other choices designate ranges of the atmosphere either above or below the stratosphere.

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Under a pressure of 4 psi and 20 degree C

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Over a pressure of 12 psi and 40 degree C

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Over a pressure of 14 psi and 50 degree C

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