Question

Scientists are interested in how the severity of acid deposition affects the soil of the red spruce forests. They design a laboratory experiment in which rainwater of different pH values is used to water soil samples taken from red spruce forests. The soil samples are the same size and contain the same ratios of sand, silt, and clay. The same amount of water is sprayed on the soil samples every day for a week. Through the experiment, the scientists measured the concentration of toxic forms of aluminum in the soil samples. Identify the likely scientific question being investigated in the experiment.
A. How does the amount of aluminum in the soil affect the pH of the rainwater?
B. How does the pH of rainwater affect the concentration of aluminum in the soil samples?
C. How does the composition of the soil affect the pH of the rainwater?
D. How does the number of days watered affect the concentration of aluminum in the soil samples?

Answer 1

The best question for this experiment is How does the composition of the soil affect the pH of the rainwater?.

What are the best factors being studied?

The main factors based on the description are:

• The pH of the rainwater: This is the factor manipulated by the researcher.
• The aluminum concentration: This is the factor researchers are evaluating.

What is the best question?

The best question would be one that relates the main two factors. Based on this, the best question would be: "How does the composition of the soil affect the pH of the rainwater?".

Learn more about rainwater in: brainly.com/question/14295571