Discussion
Which of the following is not a principle of soil-conservation measures?
Answer: C
The one that is not a principle is Control of gravity.
Soil conservation measures work by reducing the impact of raindrops on bare soil (through cover and mulch), reducing splash erosion that follows from that impact, and controlling runoff by slowing it, spreading it and guiding it safely off the land.
Gravity is the force behind runoff and soil movement, but no conservation measure controls gravity itself; measures control the water and the soil it acts on, which is why this option is the odd one out.
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