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...