Which soil horizon consists mainly of dead leaves and other organic material that is decomposing?059a5c4dc4a514b206dbe1f46bc281fd.webm77 KB aO bA cC dBedrock

Answer

The soil horizon that consists mainly of dead leaves and other organic material that is decomposing is known as the O horizon, often referred to as the organic horizon. This layer is rich in organic matter, primarily composed of decomposing plant materials, which contributes to soil fertility.

In contrast, the other options:

• A horizon (Topsoil) contains a mix of organic material and minerals.
• C horizon (Parent material) consists of weathered rock and unconsolidated material.
• Bedrock (R horizon) is the solid rock layer beneath the soil.

Therefore, the correct answer is a: O horizon.