Describe two factors that affect the magnitude of friction
between two surfaces that are touching.

The materials that are in contact

The force pushing the 2 surfaces together

its mg hope this

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.