Lesson 4: Earthworms and Underground Life
Below the surface of a golf course, an invisible community is hard at work. Earthworms tunnel through the soil, aerating it and breaking down organic matter.
Fungi thread their way through the root zone, helping grass absorb nutrients. Bacteria decompose dead plant material and release nutrients back into the soil.
This underground community — sometimes called the soil food web — is as important to the golf course as any piece of equipment.
Without it, the grass would struggle to grow no matter how much fertilizer or water was applied. The tiny invisible things are doing enormous work.
After light rain, look for earthworms on the surface of paths or fairways. Count how many you find. Can you find their burrow openings in nearby soil? Draw an earthworm’s burrow system as you imagine it beneath the surface — how deep do you think it goes? How many tunnels might there be?
The concept of an invisible community doing essential work beneath the surface is a powerful early introduction to systems thinking. Many of the most important environmental processes are invisible. Helping your student understand that important things can be happening even when you cannot see them is a foundational scientific idea that will serve them throughout this curriculum.