Precipitation is just water that has been evaporated from the Earth’s surface, including oceans, lakes and rivers. When we pollute our water, it doesn’t just stay in one place. As part of the water cycle, the polluted water gets evaporated into polluted water vapor, meaning we have polluted clouds and therefore polluted precipitation.
Polluted precipitation is commonly known as acid rain, and it is caused by pollutants being released into the air such as: Carbon dioxide, carbon monoxide, lead, nitrogen oxide, sulfur dioxides, and so much more. Normal rain water has a pH of 5 or 6, usually always almost neutral. The gases released into the air is dissolved in the rainwater, making the pH level of the rain drop to about 4 (anything becomes acidic under 6.5). The rain is now acidic.
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