Graduate students in the Division of Geological and Planetary Sciences enter with diverse undergraduate preparation—majors in astronomy, biology, chemistry, mathematics, and physics, as well as in geochemistry, geology, and geophysics. Graduate study and research within the division are equally diverse, and the graduate program aims to provide for students a depth of competence and experience in their major field, sufficient strength in the basic sciences to allow them to continue self-education after their formal training has been completed, and the motivation and training to keep them in the forefront of their field through a long and productive career. Students are encouraged to explore work in interdisciplinary areas both within and outside the division, and to gain experience in teaching.

Applicants are required to submit the application and supporting materials online prior to the posted deadline. Once the application has been submitted, you will not be able to modify supporting documents, so please proofread your materials thoroughly before submission. To successfully complete the online application process, you must: • Create a free account with CollegeNET to submit the application form online. • Include payment of the application fee or submit a fee waiver request. • Upload a Statement of Purpose. • Request GRE, TOEFL, and/or IELTS test scores to be sent directly to the California Institute of Technology (Institutional Code 4034). • Upload an official electronic copy of your transcripts or online grade reports issued by your college or university. Updated grade reports for terms in progress are not required. Students who have been admitted and plan to attend Caltech will be required to submit an official copy of all transcripts from the Registrar’s Office prior to enrollment. • Register three individuals from whom you will request letters of recommendation. • Upload a CV or Resume.