Which of the following statements is true about soil formation?

• A. Soil is always formed by human intervention
• B. Soil can only be formed from organic materials
• C. Soil may develop from bedrock's physical and chemical weathering
• D. All soil is transported from other regions

Answer: (C)

Soil formation is a complex process that involves the weathering of parent material, which can be bedrock or unconsolidated sediments. When we say that soil may develop from the physical and chemical weathering of bedrock, we are recognizing the natural processes that contribute to soil formation without human intervention. These processes include the breakdown of rock into smaller particles through factors such as temperature changes, water action, and biological activity.

The weathered material then interacts with organic matter, air, and water to create soil horizons, or layers, that exhibit various properties essential for plant growth and ecosystem functioning. The ability of soil to form in situ—directly from bedrock—is significant because it highlights the role of geological processes in shaping the landscape and supporting agriculture.

Other options suggest misleading concepts: soil formation not solely relies on organic materials, does not always require human input, and not all soil is transported from other regions; some can develop directly from untouched bedrock.