3 · en
Short, simple sentences with “altitudes”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
Snow that has fallen on the plain or at low altitudes has a short life span because it is melted by the first spring frosts, even in the coldest areas. At higher altitudes it takes a little longer, but it ends in the same way.
Members of migrating flocks of Western Gulls follow each other on updrafts, where they can reach higher altitudes and make better progress. Instead of consuming energy by flapping their wings, they simply climb and glide. Biologist William Hamilton calls this "cheap flight".
However, in some places and at certain altitudes, not even the summer sun can turn the ice into water. These altitudes, which vary from 5,500 metres in the tropics, about 4,000 metres in, for example, the Alpine range and sea level itself at the poles, are called the limit of perpetual snow.
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