Earth and the other planets closest to the Sun are made mostly of _______
A.
Rocks
B.
Metal
C.
Water
D.
Gas
A. Rocks
To determine the composition of the planets, particularly Earth and the ones closest to the Sun, we can rely on scientific research and data collected through various methods. These methods include observations from telescopes, spacecraft missions, and studies of meteorites.
Based on current scientific understanding, the answer to the question is A. Rocks. Earth and the other inner planets, namely Mercury, Venus, and Mars, are mainly composed of rocks. These rocky planets are also referred to as terrestrial planets.
Observations and studies have shown that the surface of these planets is predominantly made up of solid materials like silicate rocks, along with metals in their cores. Inner planets are denser compared to the outer gas giants due to their rocky composition.
The outer planets, such as Jupiter, Saturn, Uranus, and Neptune, are primarily composed of gases, hence the answer D.