Hannah's job involves researching the complex interactions that occur between living organisms and Earth's nonliving systems. Which discipline of Earth and space science does Hannah work in?

Its environmental science

I would the say that she works in ecology which deals at least in part with the interaction between plants and the soil which they depend on to live ie the relationship between different species of trees like pine trees which like sandy and well-drained soil and say black spruces which like to live in muskegs.