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The O horizon, also known as the organic horizon, is composed of organic materials such as decomposing plant litter (leaves, twigs), animal remains, and living organisms like insects and microorganisms. It is the topmost layer of the soil profile and plays a critical role in nutrient cycling and soil fertility.

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1y ago

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Fallen leaves make up an important part of what horizon of soil?

the "O" horizon


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What organic material make the A horizon?

The A horizon, also known as topsoil, is mainly composed of organic materials such as decomposed plant and animal matter, as well as minerals like sand, silt, and clay. This layer is typically dark in color due to the high concentration of organic matter.


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The A horizon, also known as topsoil, is composed of mineral particles, organic matter, water, and air. It is the uppermost layer of soil where plants grow and where organic material accumulates. This layer is typically darker in color due to the presence of organic matter.


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Which materials typically make up the A horizon in soil?

The A horizon, or topsoil, is typically composed of a mixture of mineral particles (sand, silt, clay), organic matter (humus), water, and air. The organic matter in this layer is a key component that influences soil fertility and overall soil health.


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