Which soil horizons indicate "true soil"?Group of answer choicesA, E, BA, E, B, C, RO, A, E, B, C, RA, E, B, C

The soil horizons that indicate "true soil" are A, E, B, C. These layers are typically present in mature soils where weathering has occurred over a long period of time.

Here's a brief explanation of each:

• A Horizon: This is the topmost layer, also known as the 'topsoil'. It is rich in organic material, which gives it a dark color. It is where most biological activity occurs.

• E Horizon: This is the layer of leaching or eluviation. It is characterized by the downward movement of water and the removal of minerals and organic matter.

• B Horizon: Also known as the 'subsoil', this layer accumulates minerals and organic matter from the layers above it. It is typically lighter in color than the A horizon.

• C Horizon: This is the parent material. It may be either unconsolidated material, like loose rock, or weathered rock. The characteristics of this layer can greatly influence the properties of the soil.

The O and R horizons are not considered part of "true soil". The O horizon is primarily made up of organic matter and decomposing materials. The R horizon is unweathered bedrock and lies beneath the C horizon.