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Simplifier
Okay, let's talk about why clouds hang out at different heights! Imagine the air around us like a bunch of layers, like a layered cake. Near the ground, the air is usually warmer because the sun heats the ground, which then heats the air. Warm air is lighter, so it rises. As it rises, it cools down. Now, clouds are basically made of water droplets or ice crystals. When that warm, moist air rises and cools, the water vapor in it turns into those tiny droplets or crystals, forming a cloud. The cloud will stop rising when it reaches a layer of air that's about the same temperature as the cloud itself. That's why you see clouds at different altitudes – they're just hanging out where the temperature matches! If the air near the ground is very humid, clouds can form at ground level, which we call fog.
Oceanographer
From an oceanographer's perspective, consider the atmosphere as a fluid, much like the ocean, but with air instead of water. Clouds, like submerged objects, find their equilibrium at a density level matching their own. A cloud's density is primarily dictated by its temperature and water content. Warmer, less dense air rises, carrying moisture until it cools and condenses into cloud droplets. The altitude at which a cloud stabilizes is determined by the atmospheric temperature and humidity profiles. If the surrounding air is warmer and drier, the cloud will evaporate. If the air is cooler and more humid, the cloud will persist or even grow. The height variation you observe reflects the dynamic interplay of these atmospheric conditions, much like how salinity and temperature gradients drive underwater currents. Just as we study thermoclines and haloclines in the ocean, atmospheric scientists study temperature inversions and humidity gradients to understand cloud formation and altitude. The composition of the cloud, while relatively consistent in terms of water, varies in droplet size and concentration, influencing its overall density and thus, its buoyancy within the atmospheric fluid.
Geophysicist
As a geophysicist, my perspective is grounded in the physical properties and processes governing our planet, though clouds are more in the realm of meteorology. However, the altitude of clouds is primarily determined by atmospheric temperature and pressure profiles. Warm air rises and cools as it ascends, and the altitude at which water vapor condenses into liquid or ice (forming clouds) depends on the dew point temperature at that pressure. The composition of clouds, while generally water or ice, isn't the primary factor dictating altitude. Instead, it's the atmospheric conditions that vary. Higher clouds form in colder, less dense air, while lower clouds form in warmer, denser air closer to the surface. The presence of condensation nuclei (tiny particles like dust or pollen) also influences cloud formation, but the atmospheric temperature and pressure gradients are the dominant controls on cloud altitude.