General Knowledge MCQ - Complete Course
Ozone Layer Depletion MCQ App & e-Book Download - 777
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MCQ: 777
Most serious group of chemicals emitted in British Columbia that causes depletion of ozone layer are
- noble gases
- halons
- halogens
- helium
b
General Knowledge App & e-Book Tests PDF Download
United Nations Environment Programme Test 788
Asteroid Belt Test 789
Refrigeration Test 790
Australia Continent Test 791
Layers of Earth Test 792
Africa Continent Test 793
Ozone Layer Depletion Test 794
Human Skeleton Functions Test 795
Indian Ocean Test 796
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