Which of the following are soil forming factors?

Which of the following are soil forming factors?

• A. Sunlight and rainfall
• B. Rock type
• C. Biotic activity
• D. Topography and climate

Answer: (D)

Soil forming factors are the conditions that shape how soils develop: climate, organisms, parent material (rock type), relief or topography, and time. The option that lists topography and climate together captures two major controls on soil formation. Climate drives the rate of chemical and physical weathering, leaching, and the turnover of organic matter, which directly determine horizons and soil depth. Topography, or the shape of the land, influences drainage, moisture retention, erosion, and exposure to weather—factors that create different soil moisture regimes and horizon development across landscapes. While sunlight and rainfall relate to climate, and rock type or biotic activity are each important factors on their own, the combination of topography and climate best represents the principal forces that shape soils, making it the most complete choice.

Soil forming factors are the conditions that shape how soils develop: climate, organisms, parent material (rock type), relief or topography, and time. The option that lists topography and climate together captures two major controls on soil formation. Climate drives the rate of chemical and physical weathering, leaching, and the turnover of organic matter, which directly determine horizons and soil depth. Topography, or the shape of the land, influences drainage, moisture retention, erosion, and exposure to weather—factors that create different soil moisture regimes and horizon development across landscapes. While sunlight and rainfall relate to climate, and rock type or biotic activity are each important factors on their own, the combination of topography and climate best represents the principal forces that shape soils, making it the most complete choice.