Final answer:
Clay is frequently used for making preparatory sketches for sculptures due to its malleability, which allows it to be easily shaped and adjusted by artists.
Step-by-step explanation:
Due to its malleability, clay is frequently used to make three-dimensional preparatory sketches for other sculptures. Clay's malleable property allows artists to easily shape and manipulate the material into their desired forms during the modeling process. The fine particles of silt in the clay contribute to its plasticity, which is enhanced by the addition of water, making it a cohesive and moldable product. Not only does this malleability facilitate the sculpting process, but it also allows for adjustments and changes to be made before the final work is produced. Once the sculpture is fired in a kiln, the clay becomes durable, turning the sketch into a more permanent piece.