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The foreign policy powers of the executive and legislative branches were left without clear boundaries in the U.S. Constitution.
Troposphere
The lowest layer of the Earth's atmosphere, where most weather phenomena occur.
Stratosphere
The layer of the Earth's atmosphere located above the troposphere and below the mesosphere, characterized by a slight temperature increase with altitude and the presence of the ozone layer.
Unhealthy Air
Air that is contaminated with pollutants at levels which are harmful to human health and the environment.
Urban Areas
Regions characterized by high human population density and vast human-built features in comparison to the areas surrounding them.
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