Question

Match the element with its approximate percentage in the Earth's crust : List A (Element) | List B (Percentage)

Aluminium	8.13%
Iron	27.72%
Silicon	5.0%
Calcium	3.63%

• A. A-2, B-4, C-3, D-1
• B. A-1, B-4, C-3, D-2
• C. A-1, B-3, C-2, D-4
• D. A-1, B-2, C-3, D-4

Answer 1

Answer:

C. A-1, B-3, C-2, D-4

Composition of Earth's Crust

The composition of the Earth's crust by mass is dominated by a few key elements.

Major Elements in Earth's Crust:

• Oxygen (O): Approximately 46.6% - The most abundant element, primarily found in silicate minerals.

• Silicon (Si): Approximately 27.7% - The second most abundant element, forming the backbone of silicate rocks.

• Aluminium (Al): Approximately 8.13% - A light but strong metal, common in feldspars and clays.

• Iron (Fe): Approximately 5.0% - Found in mafic minerals like olivine and pyroxene, and as native iron in some meteorites.

• Calcium (Ca): Approximately 3.63% - A key component of minerals like calcite (limestone) and plagioclase feldspar.

• Sodium (Na): Approximately 2.83% - Found in minerals like albite (a type of feldspar) and halite (rock salt).

• Potassium (K): Approximately 2.59% - An important constituent of feldspars and micas.

• Magnesium (Mg): Approximately 2.09% - Common in mafic minerals like olivine and pyroxene.