Answer:
well you didnt give me a link to the story or text so i dont have any info to answer sry ;(
Explanation:
The two substances that scientists use are
carbon-14 and carbon-12
Answer:
It develops over land and is cold and dry!
Explanation:
It's a continental air mass, so it develops over land! Maritime ones develop over water. It's cold and dry because it's a polar air mass, not tropical!
I hope that helped you!
