Which statement about compaction is correct?

Which statement about compaction is correct?

• A. Maceration
• B. Fermentation
• C. Compaction reduces the final volume
• D. Aeration

Answer: (C)

Compaction works by packing material tightly so air-filled gaps are squeezed out, making the particles sit closer together. The mass stays about the same, but the space it occupies decreases because the voids are reduced, so the final volume is smaller. The other processes describe different actions: maceration is breaking down solids into a slurry, fermentation is a microbial process that often produces gases, and aeration is adding air to support microbial activity. None of those describe the physical reduction in volume caused by pressing material together, which is why the statement about compaction reducing the final volume is the best choice.

Compaction works by packing material tightly so air-filled gaps are squeezed out, making the particles sit closer together. The mass stays about the same, but the space it occupies decreases because the voids are reduced, so the final volume is smaller. The other processes describe different actions: maceration is breaking down solids into a slurry, fermentation is a microbial process that often produces gases, and aeration is adding air to support microbial activity. None of those describe the physical reduction in volume caused by pressing material together, which is why the statement about compaction reducing the final volume is the best choice.