Which is a chemical property of iron?
it forms iron oxide (rust) when exposed to moisture and air.
it is a gray–black metal that is hard to the touch.
it has a melting point of 2795°f (1536°c).
it is a good conductor of heat.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.