Question

what is top most soil?

Answer 1

top most soil is also known as topsoil or A horizon. it consists of humus

Answer 2

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.