Flares in your own words

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

d. groundwater flows through the subsoil and deposits minerals.

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.