Earth,which Is Mostly Rock and Iron,has a Density of 5515

question 290

Multiple Choice

Earth,which is mostly rock and iron,has a density of 5515 kg/m³.Ganymede,Jupiter's largest satellite,contains much water and water ice and has a density of 1940 kg/m³.Io has a density of 3570 kg/m³.What conclusions have astronomers drawn from this?

• A) Io must be composed of some new material other than rocks, iron, water, or ice.
• B) Io is composed of compressed water and water ice.
• C) Io is mostly rock and iron, but because of its smaller mass, it cannot compress the material as much as Earth can.
• D) Since Io is smaller than Earth, it is expected to have a smaller density regardless of composition.

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