Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of visible light by clouds
Absorption and re-emission of visible light by the ground
Absorption and re-emission of infrared radiation by the atmosphere
Absorption and re-emission of visible light by the atmosphere
Absorption and re-emission of ultraviolet radiation by the atmosphere

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Environmental Science
Suppose yesterday morning you noticed ice crystals (frost) on the grass, yet the minimum temperature reported in the newspaper was only 35o F. The most likely reason for this apparent discrepancy is that:

The thermometer was read incorrectly
The newspaper reported the wrong temperature
Temperature readings are taken in instrument shelters more than 5 feet above the ground
The thermometer was read before the minimum temperature was reached for that day
The thermometer was in error

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