Environmental Science
Carbon dioxide is called greenhouse gas because it is

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

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Environmental Science
The earth's radiative equilibrium temperature is:

The temperature at which rates of evaporation and condensation on the earth are in balance
The temperature at which the earth is radiating energy at maximum intensity
The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The average temperature the earth must maintain to prevent the oceans from freezing solid

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Environmental Science
If a glass of water were surrounded by saturated air:

The water's temperature would slowly increase
The level of the water in the glass would not change
The level of the water in the glass would slowly decrease
The water's temperature would slowly decrease

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