Final answer:
The sculpture of Apollo by Vulca is made of terra cotta and is known as the Apulu, which was a large-scale terracotta sculpture from the peak of the temple roof in Veii.
Step-by-step explanation:
The sculpture of Apollo created by master sculptor Vulca around 500 B.C.E. is made of terra cotta. This particular masterpiece, known as the Apulu (Apollo of Veii), was originally positioned at the peak of the temple roof in Veii, Italy, and is a large-scale terracotta sculpture. Its dynamic, striding pose and the archaic smile signify life, while the drapery falls in stylized, decorative folds. The work is attributed to an Etruscan artist, Vulca, based on historical records by the Roman writer Pliny, who mentioned Vulca as the artist summoned to Rome to decorate the temple of Jupiter Optimus Maximus.