Answer:
impermeable: In geography we were taught that some rocks are permeable, allowing fluids to pass through them, while some do not allow fluids to pass through them.
microbiology: Deals with microorganisms and their effects on man
polytheism: Well, while we have atheists and others, we also have people who believing in the existence of so many God's
theology: People go to school to study God, or God's and the truthfulness of religion
Xenobiology: Has to do with something outside of Earth, more like in space