Which of the following elements are found in highest and lowest quantities respectively in the crust of the earth?

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Q: 41 (CDS-II/2015)

Which of the following elements are found in highest and lowest quantities respectively in the crust of the earth?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,64,53,37,12,4,64

keywords: 

{'elements': [0, 0, 2, 5], 'crust': [1, 1, 0, 0], 'lowest quantities': [0, 0, 0, 1], 'magnesium': [1, 0, 2, 3], 'sodium': [10, 2, 12, 23], 'calcium': [2, 0, 0, 4], 'silicon': [0, 0, 1, 0], 'oxygen': [3, 0, 1, 0], 'earth': [0, 1, 1, 1]}

The correct answer is option 4: Oxygen and magnesium.

In the crust of the Earth, oxygen is the most abundant element, making up about 46% of its mass. Oxygen is a vital component of many minerals and compounds found in the Earth`s crust. It is especially abundant in silicate minerals.

Magnesium, on the other hand, is found in relatively lower quantities in the Earth`s crust. It makes up approximately 2% of the crust`s mass. Magnesium is often found in minerals such as dolomite, olivine, and magnesite.

Options 1, 2, and 3 are incorrect. Although oxygen is indeed abundant in the Earth`s crust, silicon, calcium, and sodium are not the elements found in the lowest quantities. Similarly, while sodium and magnesium are both present in the Earth`s crust, they are not the elements found in the highest quantities.

Therefore, the correct answer is option 4: Oxygen and magnesium.