Questions: Question 5 (4 points) Which two elements are the scarcest in the crust? silicon and oxygen iron and magnesium potassium and magnesium

Question 5 (4 points) Which two elements are the scarcest in the crust? silicon and oxygen iron and magnesium potassium and magnesium
Transcript text: Question 5 (4 points) Which two elements are the scarcest in the crust? silicon and oxygen iron and magnesium potassium and magnesium
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Solution

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The answer is the third one: potassium and magnesium.

Explanation for each option:

  1. Silicon and oxygen: These are actually the most abundant elements in the Earth's crust. Silicon and oxygen together form silicate minerals, which make up the majority of the crust.

  2. Iron and magnesium: While not as abundant as silicon and oxygen, iron and magnesium are still relatively common in the Earth's crust, especially in mafic and ultramafic rocks.

  3. Potassium and magnesium: Potassium is less abundant than the other elements listed, and while magnesium is more common than potassium, it is still less abundant than silicon, oxygen, and iron. Therefore, this option represents the scarcest elements among the choices provided.

In summary, potassium and magnesium are the scarcest elements in the Earth's crust among the options given.

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