Question 37
Imagine you see a brown cloud above an industrial area or a city like Bangkok (Figure 3.26). The cloud disappears only when it rains. A group of researchers carried out these steps:
1. **Collect data on air quality:** They took photographs every day for a few days and dated them. They collected data from weather stations, pollution control stations and traffic control. They then formed a hypothesis about the substances present in the air.
2. **Collect rainwater:** The observation and analysis of this water provided evidence. It showed that pollutants exist in the air. It also showed that these substances were washed down with the rain.
3. **Gather additional evidence:** They took photographs of the sky after the rain. They analysed the results from the water tests and compared the images before and after the rain.
Based on these steps, What evidence would contradict it? Discuss in small groups.
1. **Collect data on air quality:** They took photographs every day for a few days and dated them. They collected data from weather stations, pollution control stations and traffic control. They then formed a hypothesis about the substances present in the air.
2. **Collect rainwater:** The observation and analysis of this water provided evidence. It showed that pollutants exist in the air. It also showed that these substances were washed down with the rain.
3. **Gather additional evidence:** They took photographs of the sky after the rain. They analysed the results from the water tests and compared the images before and after the rain.
Based on these steps, What evidence would contradict it? Discuss in small groups.
