Through , larger molecules are formed.

Polymerization.

If you forget what Polymerization is, here: process of when reacting monomer-molecules together in a chemical reaction to make polymer chains or three dimensional networks. There are a lot  of forms for polymerization and different systems exist to categorize them.

answer; /// i believe the name your looking for is called (plaque)or check good luck

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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