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← GeographyWhich mechanism concentrates rare earth elements in regolith?
A)Ion adsorption onto clay minerals✓
B)Direct precipitation from hydrothermal fluids
C)Mechanical accumulation by alluvial sorting
D)Bacterial sulfate reduction in ironstones
💡 Explanation
Chemical weathering concentrates rare earth elements because **ion adsorption** onto clay minerals immobilizes dispersed ions during weathering and soil formation creating deposits; therefore, this enriches regolith, rather than direct precipitation enriching hydrothermal vent systems.
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