What causes the common cold?

Colds are caused by viruses and are easy to treat. They are usually caused by germs too.

Explanation:

Colds are caused by viruses and are easy to treat. They are usually caused by germs too.v

Explanation:

air quality

poor drinking water

and heavy polution

can lead to poor health

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.