I strongly recommend that all undergraduate women (or other gender minorities) studying physics, geophysics, or astrophysics, attend an APS Conference for Undergraduate Conferences for Undergraduate Women and Gender Minorities in Physics.

Prof. Anne Sheehan maintains an excellent list of opportunities for students in geosciences / planetary sciences-- check it out under the "Student Opportunities" section of her website. The opportunities on her list include internships, scholarships, and fellowships for both undergraduates and graduate students.