Tree - What gives us oxygen?, Clean - What is the opposite of dirty?, Ice - What do we call frozen water?, Renewable  - What is the opposite of ‘non-renewable energy’?, Endangered - What do we call animals that are at risk of disappearing?, Acid rain - What do we call rain mixed with toxic chemicals?, Oxygen - What do trees provide for us to breathe?, Green  - What is the color of most recycling bins?, Smoke - What do cars release that pollutes the air?, Ozone - Which layer of the atmosphere protects us from UV rays?,

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