Q. Consider the following statements:
- The main mineral constituents of the continental mass are silica and magnesium.
- The oceanic crust mainly consists of silica and alumina.
Which of the above is / are correct?
Answer:
Neither 1 nor 2
Notes: The main mineral constituents of the continental mass are silica and alumina. It is thus called sial (si-silica and al-alumina). The oceanic crust mainly consists of silica and magnesium; it is therefore called sima (si-silica and ma-magnesium).