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Answer:
1.When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.
2. Ozone absorbs UV-B radiation from the sun. When an ozone molecule absorbs UV-B, it comes apart into an oxygen molecule (O2) and a separate oxygen atom (O).
3. Groundwater contamination occurs when man-made products such as gasoline, oil, road salts and chemicals get into the groundwater and cause it to become unsafe and unfit for human use.
Explanation: