The best choice that represents a real-life example of soil formation through chemical processes is limestone caves.
Limestone caves are formed through a process called chemical weathering, particularly dissolution, where acidic water (often from rainwater mixed with carbon dioxide) seeps into the limestone rock, leading to the formation of cavities and caves. This process also contributes to the formation of soil in the surrounding areas as the rock continues to break down chemically over time.
In contrast, beach sand and riverbed rocks are more associated with physical weathering processes, and the Grand Canyon, while a significant geological feature, is primarily shaped by erosion and sediment deposition rather than being a direct example of soil formation.
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