Geographic Earth materials modified over time by physical, chemical, and biological processes that serve many functions are considered . A)
equatorial parent materials
B)
modified soil horizons
C)
modified atmospheric materials
D)
nurtured dominant structures

modified soil horizons

Explanation: parent material are by definition unmodified. Soil is not a component of atmosphere; geographic earth materials are not atmosphere. A nurtured dominant structure is not a geographic term.

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.