Earth science studies the way the Earth presently is; the actual origin of the Earth is more of an issue for cosmology.
no, scientists study them together because some times one gives the answer for the other
Not really. Earth science is the study of how the earth came to me, plate tectonics, what the earth is made up of, and rocks and minerals. Some crystals and gems may be studied if they are considered...
Geology, geography, seismology
Science is more like reason. Anything you can possible question about life comes under science.