Tropicsby Charles F. Gritzner
The tropics are not only the birthplace of humankind but also home to 10 percent of the world's population, including 5 of the 10 most-populated countries. However, the region is not solely defined by its location; rather, its uniform weather and climatic characteristics-hot and humid throughout the year; little seasonal variation in temperature or precipitation; large amounts of annual precipitation, with no period of pronounced drought; and the world's highest annual average temperatures-set it apart from other environments. Due to its wet climate, the tropical realm is also characterized by dense rain forest vegetation cover and agriculture that never requires irrigation.
About the Author:
Charles F. Gritzner is distinguished professor of geography at South Dakota State University
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