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Geology is the study of the Earth, its processes, its materials,
its history, and its effect on humans and life in general. 
Rocks, crystals, mountains, earthquakes, volcanoes, rivers,
glaciers, landslides, floods, and many other subjects fall into
this broad field of research.  Geologists perform a wide range
of important services for our civilization: they determine the
stability of building sites, find abundant supplies of clean
water, search for valuable deposits of natural resources such as
iron, coal, and oil, and they also try to minimize the threat to
communities at risk from geologic hazards.  Geology is special
in that it is a highly field-oriented science.  A geologist's
work is usually outdoors, sometimes in out-of-the way places
such as deserts or sparsely populated mountain ranges.  Some of
the most geologically interesting places in the world are also
the most scenic.  Students of geology can expect to find
themselves working in loc