Environmental Science
Carbon dioxide is called greenhouse gas because it is

Transparent to sunlight but traps heat
Transparent to both sunlight and heat
Transparent to heat but traps sunlight
Used in green-house to increase plant growth

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

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