Assertion: asteroid belt's asteroid | /r/HasProperty | rock
Facets:
value: mainly
type: DEGREE
Source sentences:
text: In the case of comets, the difference is one of composition: while asteroids are mainly composed of mineral and rock, comets are primarily composed of dust and ice.
text: While most asteroids are composed of rock, a small portion of them contain metals such as iron and nickel.
text: Most asteroids are composed of rock, but a small portion of them contain metals such as iron and nickel.
text: While most asteroids are composed of rock, a small portion of them contain metls such as iron and nickel.
text: While many asteroids are composed primarily of rock and metal, most Kuiper belt objects are composed largely of frozen volatiles (termed "ices"), such as methane, ammonia and water.