A) Changes in Earth's orbit B) Increased solar activity C) Atmospheric particulate matter D) Decreased cloud cover
A) 1950s B) 1940s C) 1990s D) 1980s
A) Carbon dioxide B) Water vapor C) Methane gas D) Sulfate aerosols
A) 4–5% B) 20–25% C) 10–12% D) 1–2%
A) It accelerated warming B) It eliminated warming C) It masked the extent of warming D) It had no effect on warming
A) It shifted southwards B) It expanded significantly C) It shifted northwards D) It disappeared
A) 1990s Sahara drought B) 1970s monsoon flood C) 1980s Amazon fire D) 1984 Ethiopian famine
A) Solar intensification B) Global brightening C) Surface radiance D) Atmospheric clearing
A) 0.1 °C B) 1.5 °C C) 0.5 °C D) 2.0 °C
A) Repair the ozone layer B) Reduce air pollution C) Increase precipitation D) Counteract global warming
A) Because aerosols disperse quickly B) To maintain global rainfall C) To balance solar activity D) To prevent a rapid return of warming
A) It lowers evaporation B) It stabilizes precipitation C) It increases evaporation D) It eliminates condensation
A) It decreased B) It fluctuated randomly C) It increased D) It remained stable
A) Natural filters are removing aerosols B) Solar activity is decreasing C) Nations are acting to improve public health D) Industrialization has completely ceased
A) The type of chemical used B) The altitude of release C) Its effects on weather systems D) The cost of implementation
A) Higher temperatures than at the surface. B) Less sunlight was filtering through. C) More ultraviolet radiation. D) Visible smog layers.
A) Atsumu Ohmura. B) A researcher from the Los Angeles Institute. C) A group of climatologists in Estonia. D) The Swiss Federal Weather Agency.
A) 2–3% per decade. B) 4–5% per decade. C) 6–7% per decade. D) 0.1–0.3% per decade.
A) Only radio waves. B) Only ultraviolet radiation. C) All parts of the spectrum equally. D) Visible light and infrared radiation.
A) Dimming occurred even when skies were clear. B) Cloud cover actually increased. C) Cloud cover completely blocks all light. D) Cloud cover has no effect on infrared radiation.
A) 1980s. B) 1960s. C) 1990s. D) 1970s.
A) Only in Swiss research journals. B) Estonia, Germany, Israel, and the former Soviet Union. C) Across South America and Africa. D) Only in the United States.
A) They evaporate water droplets B) They decrease the number of droplets C) They act as nuclei for water droplets D) They increase the size of droplets
A) They make clouds more reflective B) They make clouds less reflective C) They make clouds transparent D) They have no effect on reflectivity
A) They increase rainfall B) They cause flash flooding C) They have no impact on rainfall D) They decrease rainfall
A) Industrial coal burning B) Vehicle exhaust emissions C) Dimethyl sulfide from oceanic plankton D) Agricultural waste burning
A) Mount Vesuvius B) Mount Pinatubo C) Krakatoa D) Mount St. Helens
A) 3 million tons B) 40 million tons C) 80 million tons D) 10 million tons
A) 3 million tons B) 40 million tons C) 80 million tons D) 15 million tons
A) Sulfates B) Dust C) Soot D) Smog
A) Complete combustion B) Nuclear fusion C) Incomplete combustion D) Chemical precipitation
A) Volcanoes B) Oceanic plankton C) Diesel combustion D) Coal use
A) Forest fires B) Diesel combustion C) Coal use D) Agricultural burning
A) 10 million B) 500,000 C) 7 million D) 1 million
A) New York B) London C) Denver D) Tokyo
A) 50 times B) 500 times C) 10 times D) 190 times |