Which of the following compounds can be used to seal soil pores and prevent loss of water in a fish pond?

Calcium carbonate can be used to seal soil pores and prevent the loss of water in a fish pond. Calcium carbonate is a chemical compound that is commonly found in rocks, shells, and pearls. It is an alkaline substance that can neutralize acids, making it an effective soil amendment that can improve soil structure and fertility. When added to a pond, calcium carbonate reacts with the water to form calcium ions and carbonate ions. These ions react with clay particles in the soil to form a hard layer that can seal the soil pores and prevent water from escaping. As a result, the water level in the pond can be maintained, and the aquatic environment can be improved.