The mineral particles found in the layers of a soil, including the topsoil and subsoil layers, were originally weathered from a. the soil's humus. b. organisms living in the soil. c. the soil's groundwater. d. the soil's parent material.

option D - the soil's parent material.

Explanation:

Weathering is the mechanical or chemical breaking down of rocks in it's original position by weather (water, wind) or other causes.

The soil parent materials are usually rocks of various kinds that are broken down after long periods of exposure to varying weather conditions. This EVENTUALLY resulting in the constituents of mineral contents present in the SUBSOIL and TOPSOIL layers

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