Use the diagrams of soil drainage setups to answer the following questions: 1) Name the soil types labelled A, B, C. 2) What is the function of cotton in the experimental setups? 3) Which soil type has the least draining ability? Why? 4) Explain why the level of water is highest in setup 2 compared to setups 1 and 3.

Set 1 gave the pure oil in the last drawing. In Set 1, oil was used below the cotton wool. The cotton wool was in contact with the oil below it, which coated the cotton fibres with oil. This made the cotton water-repellent. When the water (with dye) was added above, the water did not wet the cotton and did not drain through. Only pure oil drained into the beaker, appearing as pure oil in the last drawing. This set had the least draining because oil drains much more slowly through cotton than water does. Set 2 likely used dry cotton wool, so water drained through faster, collecting dyed water (not pure oil). Set 3 used only water, which drained quickly, collecting pure dyed water. (2) The water set up has higher dye load. The water set up (Set 3) collected pure dyed water, so all dye passed through. The oil set up (Set 1) collected pure oil with no dye.