tailieunhanh - Encyclopedia of Global Resources part 38

Encyclopedia of Global Resources part 38 provides a wide variety of perspectives on both traditional and more recent views of Earth's resources. It serves as a bridge connecting the domains of resource exploitation, environmentalism, geology, and biology, and it explains their interrelationships in terms that students and other nonspecialists can understand. The articles in this set are extremely diverse, with articles covering soil, fisheries, forests, aluminum, the Industrial Revolution, the . Department of the Interior, the hydrologic cycle, glass, and placer mineral deposits. . | 340 Edison Thomas Global Resources 31 million square kilometers which is nearly 21 percent of the entire world landmass. Deserts semideserts thorn savanna and thorn steppe lie within it. The tropics with summer rain zone constitutes approximately bands of moist and dry savannas north and south of the equator 25 million square kilometers in northern and eastern South America central and southern Africa India Southeast Asia and northern Australia and nearby islands. Areas of it lie in Central America as well. The last zone tropics with year-round rain is primarily equatorial northern South America central Africa Indonesia and Malaysia. This zone comprises tropical rain forests in its million square kilometers and has highestvalues in all categories of ecozone messurement for example the highest average temperature precipitation length of growing season and biomass. Human Impact In comparison with Earth s landmass the planet s oceans are not yet thoroughly studied for classification into biological regions. The difficulty of exploration and the flowing changing nature of oceans make it difficult to distinguish boundaries underwater. However in order to identify and protect at-risk ecosystems and to estimate exploitable resources scientists have proposed various marine ecozones for coastal areas which are the best understood. They also have the greatest human presence and use including fishing waste disposal recreation and transportation. These zones include beaches coral reefs kelp forests human-made structures such as docks and pilings mangrove swamps mudflats rocky shores and salt marshes. Deep-sea ecosystems may eventually be construed to compose ecozones such as the ecosystems around underwater volcanic vents. On land logging farming grazing domestic animals and construction of cities account for the greatest modifications to ecozones. Because of these the original vegetation cover in many temperate and tropical zones has been removed wholly or partly. .

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