life sciences body =
geosciences = mountains , soil , oceans ect
physucal = astronomy , chemistry , phisics
Life science is more on biology, about ecosystems, cellular structure, organism kindoms, you can go into many fields that require biology such as medicine, zoology, botany...
Earth science is probably more like geography explaining things like the big bang, the continental plates, volcanoes, earth quakes, meteorology, I dont think there are many jobs avaliable in this section
Physical science is more about electricity, circuits and electrical systems, molecular movement and interactions, magnetism, magnetic fields, quantum physics....
but this are middle school and high school classes and no one really looks at these and gives you a job these are just to get you to understand the concept of science and scientific studies, how to do experiments, so you are ready for college
you should really pick a class that interests you in these if you want to have a courier involving science, these are just to spark your interests