The four main branches of Earth Science are:
Geology - the study of the solid matter that makes up Earth
Oceanology - the study of everything in the ocean environment
Meteorology - the study of the physics, chemistry, and dynamics of the atmosphere of the earth
Astronomy - the scientific study of the universe as a whole, and of celestial bodies and the underlying physics governing those bodies
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Geography (geology) and Chemistry
the two main branches of science is natural science, and muncar science.
Zoology Botany Biology Genetics
i think it is Physics Chemistry Biology and i don't think there is a fourth one.... sorry that's all i know... *_*
the united states created three main branches of government