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Mathematics 7 Online
OpenStudy (anonymous):

The greenhouse effect occurs when 1. ultraviolet light is absorbed by the atmosphere. 2. steam heating systems are used. 3. radiated heat from the Earth is absorbed by the atmosphere. 4. cooling towers malfunction

OpenStudy (anonymous):

I don't know but if I had to guess I'd say 3. I'm sure that doesn't help but this is a math category...

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