Ozone depletion in the upper atmosphere caused by the release of _____ gases.

a) Helium and Hydrogen

b) Neon and Argon

c) Nitrogen and Oxygen

d) Chlorine and Bromine (more…)

The second largest country by land is _____

a) Russia

b) China

c) Canada

a) New York

b) California

c) Nevada

d) Chicago (more…)

a) Apple

b) Facebook

c) Tesla

c) Microsoft (more…)

a) Vitamin A

b) Vitamin C

c) Vitamin K

d) Vitamin D (more…)

a) Uzbekistan

b) Azerbaijan

c) Tashkent

d) Kazakhstan (more…)