<span> The temperature of the water in both beakers is greater than 8 °C
This is because since the water passes on heat to the spheres, that means they are at a higher temperature then the spheres. if they were at a lower temp. The spheres would pass on heat to the water.
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Greenhouse gases are the gases in the atmosphere that keep the air in the atmosphere. It traps the sun's sunlight. Since the heat is trapped in here, it would contribute to higher temperatures.
Could you explain more what you are looking for?