Q: Q: During what time period did poor air quality become a problem? Choices: - Chernobyl disaster - coal industry boom - second world war - industrial revolution A:
A: industrial revolution

Q: Q: What is the most common fossil fuel? Choices: - diesel oil - uranium - methane - coal A:
A: coal

Q: Q: Larger animals expend more of what to achieve locomotion? Choices: - neurons - distance - time - energy A:
A: energy

Q: Q: What is the leading cause of soil erosion? Choices: - tidal winds - volcanic explosions - glacier movement - running water A:
A: running water