Tim Callahan (academic)
Timothy J. Callahan is an associate professor of geology and environmental geosciences at the College of Charleston in South Carolina. He is director of the college's Master of Environmental Studies program and has interests in hydrogeology, wetlands and water resources."MES Faculty Members"
, College of Charleston. Retrieved 2010-01-28.

Education

Callahan holds a Ph.D. in earth and environmental science (2001) and an M.S. in from the

Geology
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of E ...
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