Question

what is the first layer of soil ​

Answer 1

Answer: O-Horizon,

Explanation:

The first layer, the O-Horizon, is the superficial top layer of soil that is primarily composed of decaying organic matter (humus), living organisms and fresh soil. This layer of the soil boasts a brown or black colour due to its organic composition and is usually very thin.

Answer 2

humus then comes top soil