SOLAR SYSTEM

Detailed explanation-1: -Argon makes up about 1% of the atmosphere and comes mostly from the decay of potassium in the Earth’s crust. It is an inert gas, which means that it does not react with other chemicals.

Detailed explanation-2: -The chemical composition of Earth is quite a bit different from that of the universe. The most abundant element in the Earth’s crust is oxygen, making up 46.6% of Earth’s mass. Silicon is the second most abundant element (27.7%), followed by aluminum (8.1%), iron (5.0%), calcium (3.6%), sodium (2.8%), potassium (2.6%).

Detailed explanation-3: -But here on Earth, nitrogen is a fairly inert gas at room temperature and is the most abundant element in Earth’s atmosphere.

Detailed explanation-4: -Among the planets, Earth is unique for its oxygen-rich atmosphere. None of the other terrestrial planets contain much oxygen in their atmosphere, despite oxygen being a rather common element in the cosmos. Part of the reason for this is that oxygen binds easily with other elements.