Unit 3 Oral Assessment

Which human activity contributes to air pollution?

• Planting trees

• Riding bicycles

• Burning fossil fuels

• Recycling paper

Which layer of the Earth's atmosphere is closest to the ground?

• Troposphere

• Stratosphere

• Mesosphere

• Exosphere

What is the name of the protective layer in the atmosphere that blocks harmful ultraviolet (UV) rays from the sun?

• Ozone layer

• Nitrogen layer

• Carbon layer

• Oxygen layer

In which direction does the Earth rotate on its axis?

• East to West

• North to South

• West to East

• South to North

What is air primarily composed of?

• Oxygen and nitrogen

• Carbon and hydrogen

• Water and sunlight

• Rocks and minerals

Which of the following is a property of air?

• It has colour.

• It has taste

• It takes up space

• It can conduct electricity

Which activity is most likely to help reduce air pollution?

• Throwing trash on the streets

• Using public transportation

• Burning leaves in the backyard

• Using plastic products excessively

When it is daytime in one part of the world, what is happening on the opposite side?

• Sunrise

• Sunset

• Midnight

• Twilight

What do we call the condition when the air is filled with harmful substances?

• Clean air

• Fresh air

• Air pollution

• Pure air

What causes day and night on Earth?

• The rotation of the Moon

• The rotation of Earth on its axis

• The orbit of Earth around the Sun

• The movement of clouds in the sky