gas
The study of rocks belongs under the geology branch of science.
This is not a branch of agriculture but a branch of medial science.
Tectonics is the study of the Earth's crust, the layer of air falls under atmospheric sciences.
Geography
Rheumatology.
Earth science
It falls under Marine Science since ichthyology is the study of fish.
Physical science
aeronautics
physical and biological
Organic chemistry
The study of insects.