Which of the following areas would most likely have the deepest layer of topsoil?

• A. A desert
• B. A tropical rainforest
• C. A temperate grassland
• D. A tundra

Answer: (C)

Verified step by step guidance

1. Understand the concept of topsoil: Topsoil is the uppermost layer of soil, rich in organic matter and nutrients, which supports plant growth. Its depth depends on factors like climate, vegetation, and decomposition rates.
2. Analyze the characteristics of each biome: A desert has sparse vegetation and low organic matter, leading to thin topsoil. A tropical rainforest has rapid decomposition due to high temperatures and moisture, but nutrients are quickly absorbed by plants, leaving less topsoil. A tundra has cold temperatures and slow decomposition, resulting in thin topsoil.
3. Focus on temperate grasslands: Temperate grasslands have moderate rainfall and a balance between decomposition and organic matter accumulation. The grasses contribute to a thick layer of organic material, which builds up over time, creating deep topsoil.
4. Compare the biomes: Temperate grasslands are most likely to have the deepest layer of topsoil due to their climate and vegetation, which promote organic matter accumulation and slow nutrient depletion.
5. Conclude the reasoning: Based on the characteristics of each biome, temperate grasslands are the correct answer because their conditions favor the development of deep, nutrient-rich topsoil.