an introductory text canot explore all aspects of environmental concerns. here, the emphasis is on the physical constrains imposed on human activities by the geologic processes that have shaped and are still shaping our natural environment. in a real sense, these are the most basic, inescapable constrains; we canot, for instance, use aresource that …
A seanse of historical perspective helps us to appreciate current challenges and to anticipate future ones.many modern environmental problems ,such as acid rain and graundwater pollution ,have come upon us very recently .others ,such as the hazards posed by earthquakes ,volcanoes ,and landslides ,have always been with us.