Question

What is the top layer of soil made of?

Answer 1

The layers of the soil are called horizons. The uppermost horizon is called the topsoil layer. 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.

Answer 2

a mixture of sand, silt, clay and broken down organic matter, called humus.

Step-by-step explanation:

the topsoil layer