1. High clouds—composed almost entirely of ice crystals, the bases of these clouds start at 16,500 feet (5,032 meters) and reach 45,000 feet (13,725 meters).
2. Cirrus —thin feather-like crystal clouds in patches or narrow bands. The large ice crystals that often trail downward in well-defined wisps are called mare's tails.
3. Cirrostratusis—a thin, white cloud layer that resembles a veil or sheet. This layer can be striated or fibrous. Because of the ice content, these clouds are associated with the halos that surround the sun or moon.
<span>4. Cirrocumulus—thin clouds that appear as small white flakes or cotton patches and may contain super-cooled water.</span>
To answer you question, The two main ingredients are Heat and coolness.
Tundra is the climate zone that <span>has cool summers, cold and harsh winters, a dry climate, and sparse vegetation. Tundra is basically the type of biome where the growth of trees are hindered due to very short growth season and extreme cold. I hope that this is the answer that has actually come to your help.</span>
The correct answer is rain forests increase greenhouse gases. I know for sure it's not the first or third answer. Rain forests are the habitats for many animal and plants but I'm pretty sure its over 50% not 30%.
I think it would have to be B. Sublimation
