| A | B |
|---|
| weather | Condition of the Earth's atmosphere at a particular time and place. |
| atmosphere | The layer of gases that surrounds the planet. |
| ozone | Forms when lightning interacts with oxygen. |
| water vapor | Water in the form of a gas. |
| pollutants | Harmful substances in the air, water, and soil. |
| soot | Particles made mostly of carbon enter the air and give smoke its dark color. |
| photochemical smog | Is caused by the action of sunlight on chemicals. |
| acid rain | Forms when nitrogen oxides and sulfur oxides combine with water in the air to form nitric acid and sulfuric acid. |
