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3、人口 Nature and rate of Population Growth Figure 1.17 Global population density: the darker the shading, the higher the population density. From Waldo Tobler.Uwe Deichmann, Jon Gottsegen, and Kelly Maloy in Technical Report TR-95-6 Copyright o 1995 National Center for Geographic Information and Analysis. Santa Barbara, CA. Reprinted by permission 环质 Environmental Geology
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4、地球物质的化学组成 Rock and Minerals inearth Atomic Structure All natural and most synthetic substances on earth are made from the ninety naturally occurring chemical elements. An atom is the smallest particle into which an element can be divided while still retaining the chemical characteristics of that element (fig 3. 1). The nucleus, at the center of the atom, contains one or more particles with a positive electrical charge(protons Dif and usually some particles of similar mass that have no charge(neutrons Hf ) Circling the nucleus *k are the negatively charged electrons 环质 Environmental Geology
环境地质学 Environmental Geology 4、地球物质的化学组成 Rock and Minerals in earth Atomic Structure All natural and most synthetic substances on earth are made from the ninety naturally occurring chemical elements. An atom is the smallest particle into which an element can be divided while still retaining the chemical characteristics of that element (fig 3.1). The nucleus, at the center of the atom, contains one or more particles with a positive electrical charge (protons质子) and usually some particles of similar mass that have no charge (neutrons中子 ). Circling the nucleus核 are the negatively charged electrons
4、地球物质的化学组成 Rock and Minerals inearth Neutron charge 0 mass 1 Prc charge mass 1 Electron charge-1 ss very small 环质 Environmental Geology
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