In the viscosity lab, what did you change to test viscosity a. friction b. gravity c. surface area d. temperature

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.

the product of the pressure and volume is also constant