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A region with plants specifically adapted to dry conditions
Fuels such as coal, oil, and natural gas
Substances discharged into the air
Any gas in the atmosphere that contributes to the greenhouse effect
An area that has similar plants
The typical weather conditions of a region over a long period of time
The process in which farmland becomes less productive because the land is degraded
One of the two times a year when the sun's rays are over the equator and days and night around the world are equal in length
Of lower quality
The trapping of the sun's heat by gases in the Earth's atmosphere
An increase in the average temperature in the Earth's atmosphere
Falling water droplets in the form of rain, snow, sleet, or hail
A gas composed of carbon and oxygen
Using natural resources in a way that they exist for future generations
The time during the year when the sun reaches the farthest northern or southern point in the sky
The condition of the Earth's atmosphere at a given time and place
A vegetation region with a mix of grassland and scattered trees