Oxygen and Silicon together comprise approximately ______ %of the earth crust?

Related Mcqs:

1. Fine-graned rocks formed on earth crust are called____________________?

   A. Intensive igneous rock
   B. Extrusive rock
   C. Sedimentary rock
   D. Plutonic

2. Most abundant mineral in the earth crust is______________________?

   A. N-Feldspar
   B. Feldspar
   C. S-Feldspar
   D. Amplubole

3. The most abundant metal in the earth’s crust and toxic to plants in low concentration is____________________?

   A. Mo
   B. Al
   C. Fe
   D. All the above

4. Potassium (K) occurs as a constituent of the earth’s crust in the proportion of_________?

   A. 23 %
   B. 2.3 %
   C. 17 %
   D. 1.7 %

   Submitted by: Shafiq Rehman

5. The relative abundance of three types of rocks ( igneous-metamorphic- sedimentary) in the earth’s crust is_________?

   A. 12.5 % -12.5 % – 75%
   B. 64.7 % – 27.4 % – 7.9 %
   C. none of A & B
   D. 7.9% – 27.7 % – 64.4

   Submitted by: Shafiq Rehman

6. Which element is found highest in earth crust?

   A. Aluminum
   B. Silicon
   C. Sodium
   D. None of the above

   Submitted by: Shafiq Rehman

7. Acid soils of the world’s arable comprise up to_____________________?

   A. 40%
   B. 30%
   C. 58%
   D. 20%

8. The nutrient element silicon (Si) is:_________?

   A. Beneficial
   B. Harmful
   C. Both a and b
   D. None of the above

   Submitted by: Shafiq Rehman

9. Most common rocks, after exposed to weathering which cover about ______% 0f the earth:

   A. metamorphic rocks
   B. Sedimentary rocks
   C. Igneous rocks
   D. Shales

   Submitted by: Shafiq Rehman

10. In Pakistan, approximately __________ mha of irrigated land is affected by salinization:

    A. 12.6 mha
    B. 5.7 mha
    C. 8.2 mha
    D. None of the above

    Submitted by: Shafiq Rehman