Carbon Cycle Quizzed

What is CO2?

• carbon monoxide

• carbohydrate

• carbon dioxide

In which process is CO2 absorbed by plants?

• respiration

• photosynthesis

• decomposition

What does "decay" mean?

• to be destroyed naturally

• to disappear

• to be produced

• to extract

How long does it take for fossil fuels to form?

• decades

• centuries

• milleniums

• millions of years

Which adjective can be used to describe fossil fuels?

• non-renewable

• unlimited

• environmentally friendly

• solid

Fossil fuels are burned in ... to generate electricity.

• hydroelectric power stations

• thermal power stations

• solar power plants

• manufacturing plants

Which causes the greenhouse effect?

• carbon dioxide

• water vapor

• methane

• all of them

Choose the correct form: "Coal is ... from the ground."

• extracting

• being extracted

• extracted

• been extracted

Choose the most suitable word. "CO2 is ... by factories."

• absorbed

• manufactured

• released

Choose the most suitable word: "... is used in car engines."

• Gasoline

• Coal

• Crude oil