A(n) involves the sharing of electron pairs between atoms, also known as a molecular bond.

Covalent bond

Explanation: Covalent/molecular bonds involves sharing electron pairs.

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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.

if you're asking what comes out, it's steam.