Which one of the following statements about our solar system is correct?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → The Earth is the densest of all the planets in our solar system.
With an average density of about 5.5 g/cm3, the Earth is the densest planet of the solar system, because of its large iron core.
Why the other options are incorrect
Option (2) The predominant element in the composition of the Earth is silicon. — Incorrect. By mass the Earth is mostly iron (about 32 percent) and oxygen (about 30 percent); silicon is about 15 percent.
Option (3) The Sun contains 75 percent of the mass of the solar system. — Incorrect. The Sun holds about 99.8 percent of the mass of the solar system.
Option (4) The diameter of the Sun is 290 times that of the Earth. — Incorrect. The Sun’s diameter is about 109 times that of the Earth.