S6 U5R - Air

Complete the sentence: _______ is a mixture of different gases.

• Oxygen

• Air

• Component

• Nitrogen

Choose all the components of air

• Oxygen

• Nitrogen

• Wind

• Other gases

Which of the following made up 78% of air?

• Oxygen

• Nitrogen

• Carbon dioxide

• Argon

Oxygen is important because we need it for_______

• A. breathing

• B. fire

• Both A and B

• None are correct

Harmful substances are called _____.

• pollution

• polluted

• pollute

• pollutants

What cause air pollution? (choose all the correct answers)

• Natural sources (dust storms, wildfires, ...)

• Harmful gases from factories, vehicles

• Dust from construction sites

• Trees

How does air pollution affect our health? (write at least 1)