Between the cold pine forests and the hot deserts lie the temperate parts of world, where temperatures are neither excessively high nor low, and rainfall is enough for a large variety of plants. The soil is deep and fertile, neither too full of lime nor too acid. Here it is easy to grow a great variety of crops and rear many kinds of animals. Plenty of building materials for good warm houses are found here. So, it is considered as the best habitat of human beings.