Which one is the most abundant of all the elements on Earth?

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Silicon

Aluminium

Carbon

Oxygen

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Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2023

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Among the given options, Oxygen (O) is the most abundant element on Earth, particularly in the Earth’s crust, which is the most accessible part of the Earth’s solid sphere. By weight, Oxygen makes up about 46.6% of the Earth’s crust.

The elemental composition of the Earth’s crust differs from that of the entire Earth. For the Earth’s crust, the most abundant elements by weight are: Oxygen (O) > Silicon (Si) > Aluminium (Al) > Iron (Fe) > Calcium (Ca) > Sodium (Na) > Potassium (K) > Magnesium (Mg). If considering the entire Earth, Iron is the most abundant element, followed by Oxygen, Silicon, and Magnesium, as the core is primarily composed of iron and nickel.

Silicon is the second most abundant element in the Earth’s crust (about 27.7%). Aluminium is the third most abundant (about 8.1%). Carbon is a crucial element for life but is far less abundant overall compared to Oxygen, Silicon, and Aluminium in the Earth’s crust. Given the options, Oxygen is clearly the most abundant.

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