Natural Resources

The percentage of water on Earth’s surface is:

• 50%

• 29%

• 71%

• 40%

Which gas is most abundant in the air?

• Oxygen

• Nitrogen

• Carbon dioxide

• Argon

Which layer contains most of the air’s mass?

• Exosphere

• Troposphere

• Stratosphere

• Mesosphere

Which gas is used in electric bulbs?

• Helium

• Argon

• Neon

• Oxygen

What is humus made up of?

• Rocks

• Sand

• Decomposed plants and animals

• Water

Ozone protects us from:

• Radio waves

• X-rays

• Ultraviolet rays

• Visible light

Fresh water on earth is approximately:

• 10%

• 5%

• 2.7%

• 15%

Which of these is NOT a use of water?

• Cooking

• Combustion

• Drinking

• Irrigation

Which day is celebrated as Ozone Protection Day?

• 16th September

• 5th June

• 22nd March

• 2nd October

Air becomes rarer as:

• We go deeper underground

• We go higher from the surface

• Seasons change

• Winds blow