1) Geophysical science 2) Geophysics 3) Vulcanology 1) Vulcanology 
Volcanology (also spelled vulcanology) is the study of volcanoes, lava, magma, and related geological, geophysical and geochemical phenomena. The term volcanology is derived from the Latin word vulcan. Vulcan was the ancient Roman god of fire. A volcanologist is a geologist who studies the eruptive activity and formation of volcanoes, and their cu...
study of volcanoes
discipline of the geologic sciences that is concerned with all aspects of volcanic phenomena.[2 related articles]
[n] - the branch of geology that studies volcanoes
volcanology, vulcanology 1. The study of the causes and phenomena associated with volcanism. 2. That branch of science that deals with the eruption of magma (molten material plus its gaseous content) upon the surface of the earth or its rise into levels near the surface. Closely related to geology, seismology, geophysics, and geochemistry. Volca...
vulcanology noun the branch of geology that studies volcanoes