किस मिट्टी के संस्तर (soil horizon) को सड़ने वाली पत्तियों और कार्बनिक कचरे से बनी सबसे ऊपरी परत के रूप में पहचाना जाता है जो ह्यूमस से समृद्ध होती है?

Which soil horizon is primarily composed of partially disintegrated and weathered parent rock material and is characterized by having minimal biological activity?

Which soil horizon is specifically identified as the Eluviation Layer, where the leaching of minerals like silicates, clay, iron, and aluminum primarily occurs?