1) Which organism produces the most oxygen on Earth? a) Trees b) Algae (plankton) c) Grass d) Cacti 2) 2. How many people can one tree provide with enough oxygen for a year? a) A) 1 person b) B) 2 people c) C) 4 people d) D) 10 people 3) Which material decomposes the slowest in nature? a) A) Paper b) B) Glass c) C) Plastic d) D) Wood 4) What can be saved by recycling one ton of paper? a) A) 5 trees and 1,000 liters of water b) B) 17 trees and 26,000 liters of water c) C) 3 trees and 500 liters of water d) D) 10 trees and 15,000 liters of water 5) In which country is the most polluted river located? a) A) China b) B) India c) C) Russia d) D) Brazil 6) Which country has the cleanest air in the world? a) A) Finland b) B) Norway c) C) Canada d) D) Japan 7) Recycling one plastic bottle can save enough energy to… a) A) Power a light bulb for one hour b) B) Produce one liter of gasoline c) C) Burn one kilogram of coal d) D) Heat one liter of water 8) Which of the following is a greenhouse gas? a) A) Oxygen b) B) Nitrogen c) C) Carbon dioxide d) D) Argon 9) On average, how much waste does one person produce per year? a) A) 100 kg b) B) 250 kg c) C) 400 kg d) D) 800 kg 10) What is the most effective way to protect nature? a) A) Plant more trees b) B) Reduce, reuse, and recycle c) C) Burn garbage d) D) Stop using paper

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