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Which of the following is the most abundant element in the Earth's crust?
Silicon
Oxygen
Aluminium
Iron
Oxygen
Oxygen is the most abundant element in the Earth's crust, making up approximately 46.6% of its mass by weight. It mostly occurs combined with other elements such as silicon, aluminium, and iron to form various oxides and silicates.
Oxygen is the most abundant element in the Earth's crust, making up approximately 46.6% of its mass by weight. It mostly occurs combined with other elements such as silicon, aluminium, and iron to form various oxides and silicates.
Think of the Earth's crust like a giant mixed fruit basket where oxygen is the most plentiful fruit peel binding everything together, while other elements like silicon, aluminium, and iron fill in the smaller spaces.
Remember the top elements of the Earth's crust with 'Only Si-Al Iron Ca Na K Mg' (Oxygen, Silicon, Aluminium, Iron, Calcium, Sodium, Potassium, Magnesium).
SiO2тАЛ тАФ Silica, the primary building block of silicate minerals in the crust
During the differentiation and formation of the Earth, lighter elements and gases migrated upward or combined into stable mineral structures. Oxygen, being highly reactive, readily bonded with electropositive elements like silicon and metals, forming the vast silicate and oxide mineral frameworks that make up the lithosphere.
Oxygen constitutes about 46.6% of the Earth's crust by mass.
Silicon is the second most abundant element, accounting for about 27.7%.
Aluminium is the third most abundant element and the most abundant metal in the crust (~8.1%).
Iron follows as the fourth most abundant element (~5.0%).
Formation of silicate minerals and rocks that form the lithosphere
Crucial component for weathering and oxidation processes on the Earth's surface
Abundance by mass in the Earth's crust: Oxygen (~46.6%), Silicon (~27.7%), Aluminium (~8.1%), Iron (~5.0%).
Option A (Silicon) is the second most abundant element. Option C (Aluminium) is the most abundant metal. Option D (Iron) is the fourth most abundant element overall.
B is correct тАФ Oxygen is the most abundant element in the Earth's crust by mass, accounting for nearly half of its total composition.
For competitive exams like RRB JE, always distinguish between the most abundant element in the entire Earth (which is Iron, due to the core) versus the Earth's crust (which is Oxygen).
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