The B.S. degree is designed for students interested in a scientific perspective on environmental issues. The major is designed to encourage breadth in the physical and life sciences and depth in a chosen area of scientific concentration, such as such as marine ecosystems, toxicology, hydrology and chemical cycling, or climate change. The A.B. degree in Earth and Ocean Sciences is designed as a flexible major for those students interested in the Earth, its atmosphere and the oceans. The major is intended to provide a general knowledge of the processes that shape and control the environment in which we live.