Assertion: solar system's planet | /r/HasProperty | composed by mercury
Facets:
value: primarily
type: DEGREE
value: of metal
type: OTHER
value: of rock
type: OTHER
Source sentences:
text: by composition: terrestrial or rocky planets: Mercury, Venus, Earth, and Mars: The terrestrial planets are composed primarily of rock and metal and have relatively high densities, slow rotation, solid surfaces, no rings and few satellites.