Which of the 5 Soil Forming Factors is not influencing soil formation on Mars or the Moon?

Question

BlackTom AI · Accepted Answer

To tackle this question, we first identify the five soil forming factors: climate, organisms (biota), relief/topography, parent material, and time.
Option 1: Plants & Animals (Biota) — On Mars or the Moon, there is essentially no life or biological activity. Since biota contribute organic matter, soil structure, and weathering through living processes on Earth, their influence would be absent on these bodies. This makes this option the correct choice for a factor not influencing soil formation there.
Option 2: Topography — The surface slope, elevation, and landscape features affect drainage, erosion, and microclimate, even in desert or extraterrestrial contexts. While Mars and the Moon have extreme topographies that influence weathering indirectly, topography still functions as a factor in shaping soil or regolith properties, so it does have influence.
Option 3: Parent Material — The original rocks and minerals from which soils develop are foundational to soil composition. On Mars and the Moon, regolith derives from local bedrock and volcanic or impact-fragmented material, so parent material clearly influences soil formation there.
Option 4: Time — The duration over which weathering and soil-forming processes operate matters everywhere. Longer exposure typically leads to more alteration of materials, regardless of planetary body, so time is an influencing factor on Mars and the Moon as well.
Option 5: Climate — Temperature, precipitation (or lack thereof), wind, and radiation regimes define weathering intensity and soil development. Mars and the Moon have extreme and unique climatic conditions that still constitute a climate factor affecting regolith evolution, albeit differently from Earth.
In summary, while biota profoundly shape soils on Earth, the absence of plants and animals on Mars and the Moon means this factor would not influence soil formation there, whereas the other factors—topography, parent material, time, and climate—remain relevant in shaping extraterrestrial soils.

SAS 005 001 SQ 2025 Week 3 Online Module, Part 1: Graded Mini-Quiz- Soil Forming Factors

Which of the 5 Soil Forming Factors is not influencing soil formation on Mars or the Moon?

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