How does the function of an earthworm's crop differ from that of its gizzard?

As earthworms move, they take soil into their mouths. Earthworms get the energy they need to live from organic matter found in the soil. From the mouth the soil moves to the crop, where it is stored. Behind the crop is a muscular structure called the gizzard. Here, the soil and food are ground. In the intestine, the food is broken down and absorbed by the blood. Undigested soil and wastes leave the worm through the anus.