pressure at which the processes occurred temperature at which the processes occurred chemical impurities present as the processes occurred amount of time passed since the processes occurred
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The mineral quartz naturally forms in various colors. Which difference in quartz formation results in the different colors?
Possibilities:
- pressure at which the processes occurred
- temperature at which the processes occurred
- chemical impurities present as the processes occurred
- amount of time passed since the processes occurred

chemical impurities present as the processes occurred