Question

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

Explanation:

Leaching is the process by which water - soluble substances are carried downward through the soil. Nutrients, pesticides, and harmful chemicals are water - soluble and can be carried by water in the soil. Airborne particles are in the air and not typically carried by leaching. Large natural objects like boulders and rocks are immobile in the context of leaching. Living organisms are not carried by leaching in the way these substances are.

Answer:

nutrients, pesticides, and potentially harmful chemicals