Earthworms are always eating. As they eat, they make "castings". They leave these castings behind after they digest their food. It is strange, but these castings are in high demand.
Earthworm castings have a lot of nutrients. Castings are great for soil. They can be used in gardens and houseplants. They are also good for vegetables and fruits.
Castings can be added to improve the soil. They can even replace the soil altogether.
Earthworm castings are safe for the environment. They are also safe for plants, humans and animals. Castings are clean and they have no odor. This makes them good to use indoors. Castings are also good at keeping away bugs. The only bad thing about the castings is that they are expensive!
What is the most likely reason that castings are expensive to buy?
A. Earthworms do not make castings often enough.
B. There are not enough earthworms to make castings.
C. It costs a lot of money to gather the castings.
D. Earthworms only make castings at night.
1 answer
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