Pluto's density is 1.8 g/cm3. Iron is about 5 g/cm3. Rock is about 3 g/cm3. Ice or water is 1.0 g/cm3. This implies that
A)Pluto has a large iron-nickel core.
B)Pluto is about 35% water ice and 65% rocky material.
C)Pluto is all rock.
D)Pluto is all water or water ice.

Question

Quizplus · Accepted Answer

Pluto's density is lower than rock but higher than pure water or ice, which suggests that it is a combination of rock and ice. Based on the known densities of different materials, it is estimated that Pluto is about 35% water ice and 65% rocky material. This also suggests that Pluto likely has a smaller iron-nickel core compared to rocky planets like Earth.

Pluto's Density Is 1