Worksheet Chapter 7: Air

1. Fill in the blank: The three components required for combustion in the fire triangle are fuel, heat, and ________.

2. True or False: Photosynthesis is the only natural biological process that absorbs carbon dioxide and releases oxygen into the atmosphere.

3. State two human activities that contribute to the increase of carbon dioxide concentration in atmospheric air.

4. Explain the toxic mechanism of carbon monoxide on the human body when inhaled from vehicle exhausts.

5. Explain how the carbon cycle maintains a balanced level of carbon dioxide gas in the atmosphere.

6. A student accidentally lights a small wastepaper basket fire in the laboratory. Explain two distinct fire safety principles based on the fire triangle that can be applied to extinguish it.

7. True or False: Carbon dioxide is the most abundant gas present in Earth's atmosphere.

8. Name the primary air pollutants responsible for causing acid rain and state one negative environmental effect of acid rain.

9. Which atmospheric gas makes up approximately 21% of clean air volume?

10. Propose three actionable steps that communities can take to reduce local air pollution levels.