sci 275 Environmental Science 9e Ch05
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CRITICAL THINKING 73 T he Earth formed approximately 4.5 billion years ago. At first, the planet was a barren mass of rock and ice. Over billions of years, however, life evolved. T oday , the Earth’ s surface is carpete d with a rich and diverse array of life forms existing in a complex web of life. As anyone who has traveled across any major continent knows, however, the biosphere varies from one region to the next. That is to say, the biosphere is divided into distinct regions, which ecologists call biomes. Biomes differ from one another in climate— that is, in rainfall, sunlight, temperature, and other abiotic factors. These differences, in turn, lead to marked variations in the types and abundance of species. Principles of Ecology: Biomes and Aquatic Life Zones Weather and Climate: An Introduction The Biomes Aquatic Life Zones Spotlight on Sustainable Development 5-1: Dreaming of a Green Christmas 5.3 5.2 5.1 CHAPTER OUTLINE CHAPTER 5 Let us permit nature to have her way: she understands her business better than we do. —Montaigne
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Transcript of sci 275 Environmental Science 9e Ch05
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