In the context of solutions, which soil particle size is most effective at retaining water?

• A. Clay
• B. Silt
• C. Sand
• D. Gravel

Answer: (A)

Verified step by step guidance

1. Understand the context: In soil science, the ability of soil particles to retain water is influenced by their size and surface area. Smaller particles have a larger surface area relative to their volume, which allows them to hold more water.
2. Identify the soil particle sizes: The common soil particles, in order of increasing size, are clay, silt, sand, and gravel.
3. Consider the properties of each particle size: Clay particles are the smallest, followed by silt, sand, and then gravel, which are the largest.
4. Analyze water retention: Smaller particles like clay have a high surface area and can retain more water due to their ability to hold water molecules tightly. Larger particles like gravel have less surface area and retain less water.
5. Conclude which particle retains the most water: Based on the analysis, clay, being the smallest particle with the highest surface area, is most effective at retaining water compared to silt, sand, and gravel.