Surface fire burns which part of soil?

سطح کی آگ مٹی کے کس حصے کو جلاتی ہے؟

Answer: O-horizon

Surface fire primarily burns the O-horizon.

It is the top layer of soil rich in organic matter like decaying leaves and plants.

It has a significant impact on the organic content but usually does not reach deeper soil layers like the A or B horizons.