Briefly describe the characteristics of each soil horizon from the top layer to the bottom layer

There is six horizen. 1. O Horizon - The top, organic layer of soil, 2. A Horizon - The layer called topsoil; 3. E Horizon - This layer is beneath the A Horizon and above the B Horizon. It is made up mostly of sand. 4. B Horizon - Also called the subsoil - this layer is beneath the E Horizon and above the C Horizon. 5. C Horizon - it's called regolith: the layer beneath the B Horizon and above the R Horizon. 6 R Horizon - this is last and the unweathered rock layer that is beneath all the other layers.

It may possibly be c i think |-/

The correct answer is  "c".  it is "c" because melting is an endothermic change, and endothermic get's energy from surroundings.