Q. The most abundant element in the Earth’s crust is

A
Aluminum
B
Silica
C
magnesium
D
Oxygen
Solution:

Element and approx. % by weight:
Oxygen – 46.6

Silicon – 27.7

Aluminum – 8.1

Iron – 5.0

Calcium – 3.6

Sodium – 2.8

Potassium – 2.6

Magnesium – 2.1

All others – 1.5

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