Which sphere does a volcanologist most directly study?

Volcanoes are formed when the magma rises up towards the surface of the earth. It takes place near active plate boundaries as well as in the regions of hotspots. Scientists who study the volcanoes are considered as the volcanologist.

The sphere in which a volcano is directly studied is the lithosphere,

Volcanoes are formed both on the land areas as well as over the ocean floors. And as volcanic eruption takes place, a huge amount of toxic gases are released into the atmosphere. So, a volcano interacts overall with the geosphere, which collectively includes the lithosphere, atmosphere, and the hydrosphere.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it