ge ‧ o ‧ phys ‧ ics /ˌdʒiːəʊˈfɪzɪks $ ˌdʒiːoʊ-/ BrE AmE noun [uncountable]
the study of the movements of parts of the Earth, and the forces involved with this, including the weather, the oceans etc
—geophysical adjective
—geophysicist /-zəsəst, -zɪsəst/ noun [countable]