Do worms mix and till the soil?

 

We layered the jars with black dirt and sand.  Then one

jar got worms and the other did not.  We are watching to

see how long it will take for them to mix and till the soil.  

These experiments teach students the value of worms 

for healthy soil. As the worms eat the soil and dead 

leaves, their castings/poop are filled with nutrients 

and their tunneling allows more water and oxygen into 

the soil to benefit plants.  I also learned a lot about worms

during these lessons.