We study the earth and planets in order to understand their origin, constitution, and development. The approach to these problems relies heavily on the basic sciences. Programs of study and research are pursued in geology, geobiology, geochemistry, geophysics, planetary science, and environmental science and engineering. The curriculum is flexible so that students with degrees in biology, chemistry, engineering, or physics may carry out graduate work within the division. Interdisciplinary studies are encouraged and students may carry out academic and research programs within and between different divisions.