Question
                What is a greenhouse gas? (1 point)
• a gas that forms a physical barrier to block escaping heat
O a gas at higher temperature than the surrounding atmosphere
• any gas in the troposphere that absorbs and re-emits infrared radiation
• any gas in Earth's atmosphere
            
        • a gas that forms a physical barrier to block escaping heat
O a gas at higher temperature than the surrounding atmosphere
• any gas in the troposphere that absorbs and re-emits infrared radiation
• any gas in Earth's atmosphere
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