agriculture - Keeping livestock and growing crops for human use., carbon cycle - All carbon dioxide (CO2) exchanges on Earth., carbon dioxide (CO2) - Gas in the atmosphere that is essential for life on Earth. CO2 is also one of the greenhouse gases., climate change - Change in climate patterns (such as higher temperatures)., desertification - When previously usable land turns into a desert., dimension - The perspective you choose when you explore a specific subject: physical, economic, socio-cultural, demographic, political, etc., effective precipitation - Precipitation minus evaporation., enhanced greenhouse effect - When the ‘normal’ impact of carbon dioxide (CO2) on the Earth’s climate is magnified due to the sharp increase in CO2 in the atmosphere., firn basin - Basins that catch snow high in the mountains., fossil fuel - Fuel (natural gas, oil and coal) formed over millions of years from plant or animal remains., glacier - Large body of ice that slowly moves down a slope., greenhouse effect - When gases in the atmosphere trap the sun’s heat., ice age - A cold period in which the land is covered by vast ice sheets., irrigation - Artificial methods for watering crops., land ice - A layer of perpetual snow that has been turned into a thick sheet of ice., moraine - Debris (sand, gravel and rock) that is carried along by a glacier., photosynthesis - Process by which plants and trees use sunlight to turn water and carbon dioxide into sugars and oxygen., sea-level rise - Higher sea levels caused by the melting of glaciers and land ice and the thermal expansion of sea water., steppe - Dry area that gets just enough rain for grasses and shrubs to grow.,

Chapter 6 section 4

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