Discuss Together with a partner, talk about the amount of solar energy that falls on a given area. What happens when light is not spread out? What happens when the light is more spread out? Relate this idea to the sun's energy and Earth.

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.

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