In some capacity, earth scientists study all of the above listed. They focus on ecology (how different organisms function within ecosystems), food chains, climates and weather patterns, aspects of the atmosphere, soil and the Earth's mineral components, farming, and how man's machines both help and hurt the environment.
One is a longer process than the other, also one is more toxic.
If i remember correctly they should be adenine (A), thymine (T), guanine (G) and cytosine (C). i hope this helps. sorry if they arent all correct.
They can conclude that the epicenter is the same distance from both recording stations.
