I think it's radioactivity. From what I learned in 5th grade, the hardness of a mineral can be a major indicator, as a diamond is the strongest mineral, and talc is extremely easy to break down (I think it's Talc at least). A quick google search showed no mention of radioactivity. Also radioactivity just doesn't sound right compared to the other answers.
It's been a while since I've gone over it so I could be wrong.
Answer:
below
Explanation:
it can also be caused from death, strict parents, toxic relationships, or a lack of friends and socialization. Usually being held back by older people or fear and anxiety of not being accepted.
As you open the diaphragm it’s widest the most light is able to enter because it is open allowing all of the light to come in.
