What major elements compose Earth?

The correct answer highlights the major elements that compose the Earth's atmosphere rather than the elements that make up Earth's overall structure. The primary components of the Earth's atmosphere include nitrogen, which makes up about 78% of the atmosphere, and oxygen, which accounts for about 21%. Argon, though a noble gas, is also present in trace amounts, around 0.93%. These three gases dominate the Earth's atmosphere and are essential for various biological and ecological processes.

In contrast, the other options do not accurately represent the primary elements found in the Earth's atmosphere or its crust. For instance, the first choice lists hydrogen and helium, which are the most abundant elements in the universe but are not major constituents of Earth. The second choice includes silicon, which is significant in the Earth's crust but does not accurately include the major atmospheric components. Lastly, the last option suggests carbon, gold, and copper, none of which are major constituents of the atmosphere or Earth as a whole.