One could be the lighting of a firefly, because there is a chemical reaction that happens inside of the firefly that makes it glow, and another could be making food, because you have to add baking soda in some foods, and it reacts with other ingredients. Hope that helps.

An Aquifer layer is most likely made up of cracked rocks.
Answer:
Religious music (also sacred music) is music performed or composed for religious use or through religious influence.[1] It may overlap with ritual music, which is music, sacred or not, performed or composed for or as ritual
Answer:positively cheap labour.
Then negatively Low taxes
Explanation:because it's of low level school people or drop outs who don't mind much of wages as compared to office related work or jobs
Then low taxes as a result of favour being imposed on the cheap kabour