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The same people are tested and retested over a period of years in a
Weathered Rock
Rock that has undergone physical or chemical breakdown due to atmospheric or biological elements, leading to changes in texture, composition, or color.
O Horizon
The O Horizon is the uppermost layer of soil, primarily composed of organic matter such as decomposing leaves and other plant material, crucial for nutrient cycling and soil fertility.
C Horizon
The layer of soil that consists of weathered rock and little organic material, often serving as the foundation of the soil profile.
A Horizon
The top layer of soil, known as topsoil, where organic matter decays and nutrients are readily available for plants.
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