review unit 9

What is the main cause of global warming?

• A. Planting trees

• B. Greenhouse gases

• C. Recycling waste

• D. Renewable energy

Which of the following is a renewable energy source?

• A. Coal

• B. Solar power

• C. Oil

• D. Natural gas

What does "reduce, reuse, recycle" encourage us to do?

• A. Waste more resources

• B. Increase pollution

• C. Save energy and resources

• D. Ignore environmental issues

What is deforestation?

• A. Cutting down forests

• B. Planting more trees

• C. Protecting wildlife

• D. Cleaning polluted rivers

Planting more _______ can help reduce carbon dioxide levels.

• A. trees

• B. flowers

• C. grass

• D. bushes

People can reduce air pollution by using _______ transport like bicycles and buses.

• A. public

• B. private

• C. shared

• D. personal

What is the main purpose of Earth Day?

• A. To celebrate technology

• B. To raise awareness about environmental protection

• C. To honor scientists

• • D. To plant crops

Which gas is most responsible for the greenhouse effect?

• A. Oxygen

• B. Nitrogen

• C. Helium

• D. Carbon dioxide

To save electricity, we should turn off the _______ when not in use.

• A. stove

• B. lights

• C. fan

• D. heater

What is one major effect of melting polar ice caps?

• A. Cleaner water

• B. Faster plant growth

• C. Rising sea levels

• D. Stronger winds