The uppermost layer of the land forms a layer called soil. Soil is defined as a mixture of clay, or rocky particles and organic remains of plants and animals. It is responsible for forming the upper layer of surface of earth which means that it covers the land.

What is the uppermost layer?

The uppermost layer is called crust.

Why is the upper layer of soil dark?

The top soil is the topmost layer of the soil. ... However, the uppermost layer of soil is black in color because it contains humus which is a dark brown or black coloured organic matter that contains carbon in high concentration. So, due to the presence of humus, the uppermost layer of soil is black in color.