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Environmental Science MCQs – Practice Test 15 (Chapter 6)

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Introduction to Environmental Sciences Quiz – Practice Test 15 PDF Download

MCQ 71: What is the concentration of O2 in the atmosphere?

  1. 0.12
  2. 0.209
  3. 0.21
  4. 0.22

MCQ 72: What makes sea water not to be safe for drinking ?

  1. High salt concentration
  2. High minerals
  3. Marine water pollution
  4. Density of saewater

MCQ 73: What is an approximate percentage of dissolved solid in seawater?

  1. 0.045
  2. 0.035
  3. 0.045
  4. 0.025

MCQ 74: Which three elements constitute 90% of the sea water?

  1. Cl, Na, Mg
  2. S, Ca, K
  3. Cl, S, Si
  4. C, K, O

MCQ 75: What does ionosphere shell consist of ?

  1. Electrons
  2. Neutrons
  3. Protons
  4. atom

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