Question

This layer of soil is composed of plant roots, fallen leaves, humus and dead insects. 

Horizon O

Horizon A

Horizon B

Horizon C​

Answer 1

Answer:

The topsoil layer is a mixture of sand, silt, clay and broken down organic matter, called humus. Humus is rich, highly decomposed organic matter mostly made from dead plants, crunched-up leaves, dead insects and twigs. ... The topsoil is relatively thin but it has most of the soil's nutrients.

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Answer 2

Horizon O

Explanation:

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