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Astudent compared the chemical composition of soil in a certain area with the bedrock beneath it. she found that the chemical compositions were different. which statement would best explain the chemical composition?

a. the areasecond rain and extreme temperatures caused the soi'll to develop.
b. the soils rock particles were brought from a different location by erosion.
c. the areas water washed iron oxide from the a horizon to the d horizon.
d. the soil layers were mature because a large amount of time had passed.

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