alleryStart learning →By mass, silicon makes up close to what fraction of the earth's crust, ranking second in abundance only to oxygen?
AAbout one-tenth
BAbout one-fourth
CAbout one-half
DAbout three-fourths
Answer & Solution
Correct answer: B. About one-fourth
1. Silicon-oxygen compounds (silicates) dominate the composition of rocks, soils, and clays.
2. The text states: "Silicon makes up nearly one-fourth of the mass of the earth's crust—second in abundance only to oxygen."
3. This is why silicate minerals form the bulk of common rocks and why silicon (via silica and silicates) is so geologically important.
4. So silicon's share of the crust's mass is close to one-fourth, not one-tenth, one-half, or three-fourths.
_Source: OpenStax Chemistry Ch 18 "Representative Metals, Metalloids, and Nonmetals", p.980 §18.3 Structure and General Properties of the Metalloids_
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