Q.71
Soil Science- ICAR JRF/SRF 2024
Arranging Order
Pick out the correct sequence of elemental presence (% by weight) in Earth's crust.
  • Elemental Abundance in Earth's Crust (by weight %): According to geochemical data compiled by Clarke and Washington:
  • Oxygen ($O$): $\approx 46.6\%$
  • Silicon ($Si$): $\approx 27.7\%$
  • Aluminum ($Al$): $\approx 8.1\%$
  • Iron ($Fe$): $\approx 5.0\%$
  • Calcium ($Ca$): $\approx 3.6\%$
  • Sodium ($Na$): $\approx 2.8\%$
  • Potassium ($K$): $\approx 2.6\%$
  • Magnesium ($Mg$): $\approx 2.1\%$
  • Decreasing Order: Oxygen ($O$) > Silicon ($Si$) > Aluminum ($Al$) > Iron ($Fe$). (Correct answer: Option 3)
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