Factors involved in soil formation include . A. nitrogen-fixing bacteria and grazing by herbivores B. erosion, level terrain, and the absence of rooted vegetation C. weathering of parent material and the addition of organic material D. tropical climate, acid precipitation, and frequent wildfires

The correct option is C.

weathering of parent material and the addition of organic material .

Explanation:

Weathering of parent material and the addition of organic material leads to soil formation because weathering involves the break down of rocks by agents such as heat, ice, pressure, water into smaller particles. The broken rocks are then transported to another place where it decompose and mixed with organic materials or matter to form soil. These organic materials include dead and remains of plants and animals which decomposed and when mixed with broken rock particles, it form soil.

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