B2 2020 HURST

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Across
  1. 2. Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals.
  2. 3. Average temperatures and precipitation of an area over a year
  3. 6. The area over which an air mass formed / originated
  4. 8. Overpopulation or overabundance occurs when a species' population exceeds becomes so excessive that people deem it must be managed. It can result from an increase in births (fertility rate), a decline in the mortality rate, an increase in immigration, or a depletion of resources.
  5. 9. Water vapor, water vapour or aqueous vapor is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice.
  6. 10. When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain. Major sources of nitrogen oxide emissions include: Cars and trucks. Coal-fired power plants.
  7. 14. Measure of the amount of water vapor in the air
  8. 16. The measure of how hot or cold the air is. It is the kinetic energy of the gas that makes up air
  9. 18. A colorless, odorless, gaseous element, represented by the symbol “O”, with an atomic number of 8, and constitutes about 21% by volume of the atmosphere, and biologically important for its role in various biochemical and physiological processes, especially of aerobic organisms.
  10. 20. dew point equals the temperature at which the air be completely saturated 100% humidityAircan be cooled to its dew point by conduction, when air contacts a cool surface, such as grass or car, etc.
  11. 21. the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.
  12. 22. Deforestation is the permanent removal of trees to make room for something besides forest. This can include clearing the land for agriculture or grazing, or using the timber for fuel, construction or manufacturing. Forests cover more than 30% of the Earth's land surface, according to the World Wildlife Fund.
  13. 25. the region of the atmosphere above the mesosphere and below the height at which the atmosphere ceases to have the properties of a continuous medium. The thermosphere is characterized throughout by an increase in temperature with height.
  14. 26. The air is full of water vapor 100% humidity
  15. 27. the region of the earth's atmosphere above the stratosphere and below the thermosphere, between about 30 and 50 miles (50 and 80 km) in altitude.
Down
  1. 1. a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.
  2. 4. the lowest region of the atmosphere, extending from the earth's surface to a height of about 3.7–6.2 miles (6–10 km), which is the lower boundary of the stratosphere.
  3. 5. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
  4. 7. the outermost region of a planet's atmosphere.
  5. 11. Methane is gas that is found in small quantities in Earth's atmosphere. Methane is the simplest hydrocarbon, consisting of one carbon atom and four hydrogen atoms. Methane is a powerful greenhouse gas. Methane is flammable, and is used as a fuel worldwide.
  6. 12. the layer of the earth's atmosphere above the troposphere, extending to about 32 miles (50 km) above the earth's surface (the lower boundary of the mesosphere).
  7. 13. large body of air with uniform temperature and moisture content
  8. 15. the layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. It lies above the mesosphere and extends from about 50 to 600 miles (80 to 1,000 km) above the earth's surface.
  9. 17. a colorless odorless inert gaseous element found in the air and in volcanic gases and used especially in lasers and electric bulbs —symbol Ar — see Chemical Elements Table.
  10. 19. a colorless unstable toxic gas with a pungent odor and powerful oxidizing properties, formed from oxygen by electrical discharges or ultraviolet light. It differs from normal oxygen (O2) in having three atoms in its molecule (O3).
  11. 23. Weights of all are pressing down on Earth's surface. Warm air is less dense and Rises causing low air pressure. Cool air is more dense and sinks causing high air pressure
  12. 24. The general day-to-day conditions of an area