What are the concepts of geography that us analyze characteristics of the world's regions?

Geography is the study of the physical features of the Earth and its atmosphere – including landscape development, weather and climate, and geologic concepts – as well as the influence of human activity – including cultural, economic, and political activity – on those physical features.  Geography students, as they study the many aspects of our physically and culturally diverse world, tend to become more adept at tasks that require both spatial and critical thinking skills. World Regional Geography covers the basic elements noted above but within a regional context.  Ultimately, World Regional Geography is concerned with the physical and human characteristics that make the regions of our world distinctive.  As you progress through the course, the units will discuss each major world region in detail, placing particular emphasis on cultural and societal structures.  Regions will be discussed within a global framework in the hope that you will gain a better comprehension of how the world map is being defined and redefined.  In addition, you will study key global issues such as international conflict and cooperation, environmental degradation, population growth, and globalization.

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.