Question

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

Explanation:

Leaching is the process by which water-soluble substances are carried downward through the soil. Airborne particles are not carried by leaching as they are in the air. 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 to be carried by the water movement associated with leaching. Nutrients (which can dissolve in water), pesticides (many of which are formulated to be somewhat soluble for application purposes), and potentially harmful chemicals (if they are water - soluble) can be carried downward through the soil by leaching.

Answer:

nutrients, pesticides, and potentially harmful chemicals