Question

what kinds of substances can leaching carry downward through the soil?
airborne particles
living organisms such as plants and animals
boulders, rocks and other large natural objects
nutrients, pesticides, and potentially harmful chemicals

Explanation:

Leaching is the process by which water-soluble substances are washed out of the soil. Nutrients, pesticides, and potentially harmful chemicals are water - soluble and can be carried downward through the soil by leaching. Airborne particles are carried by air, not by the leaching process (which is water - related). Living organisms such as plants and animals are not typically carried downward through the soil by leaching. Boulders, rocks, and other large natural objects are too large and not soluble, so they are not carried by leaching.

Answer:

nutrients, pesticides, and potentially harmful chemicals