Final answer:
Objects comprised mainly of metals and rocky materials, orbiting the Sun in circular paths, and grouping in belts align with the characteristics of asteroids, notable for their presence in the asteroid belt.
Step-by-step explanation:
Objects that are made up mostly of metals and rocky material, have circular orbits around the Sun, and tend to group together in belts are known as asteroids. These asteroids are primarily found in the asteroid belt between Mars and Jupiter though some do cross the orbits of other planets. The majority of asteroids are remnants from the early stages of the solar system before the planets themselves formed and represent a transitional rocky composition. They, along with comets, are believed to be small chunks of material left over from the formation process of the solar system.