. How could extra carbon dioxide be responsible for increasing temperatures on Earth?
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a. extra carbon dioxide is leading to more heat being trapped in Earth’s atmosphere
b. carbon dioxide is flammable
c. extra carbon dioxide leads to extra methane in the atmosphere
d. carbon dioxide produces heat
a. extra carbon dioxide is leading to more heat being trapped in Earth's atmosphere
Examine Graph 1 and then answer Questions 3 through 5. Graph 1 shows the level of carbon dioxide that was in the atmosphere in prehistoric times. Scientists retrieved this data from air bubbles trapped in ancient ice in Vostok, Antarctica. Carbon dioxide levels are provided in parts per million (ppm).
3. What time frame does this graph include?
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a. about 400,000 years ago to the present
b. from the present day to 400,000 years in the future
c. one million years ago to the present day
d. the graph does not provide a timeframe
a. about 400,000 years ago to the present
About what is the highest level of parts per million of carbon dioxide (ppm) in the air in the 400,000 years before modern time? (In other words, what level of carbon dioxide was never exceeded?)
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a. carbon dioxide levels never went over about 250ppm
b. carbon dioxide levels never went over about 275ppm
c. carbon dioxide levels never went over about 300ppm
c. carbon dioxide levels never went over about 300ppm
Examine Graph 2 and then answer Questions 6. Graph 2 shows the amount of carbon dioxide in the atmosphere at the Mauna Loa Observatory in Hawaii over several recent decades.
6. What time frame does this graph include?
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a. about 1958 to 2000
b. about 1958 to 2010
c. about 1958 to 2019
d. about 1960 to 2010
c. about 1958 to 2019
Examine Graph 3 and then answer Questions 10 through 11. Graph 3 shows the temperature anomalies of Earth. This data was put together by paleoclimatologists – scientists who study past climates – using observations of ancient ice samples. Temperature anomaly is a measurement of how far off the temperature was from the average. A positive number means Earth was warmer than average that year. A negative number means Earth was cooler than average.
10. What time period does this graph include?
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a. 800,000 years ago to the present
b. from the present day to 800,000 years in the future
c. one million years ago to the present day
d. the graph does not provide a timeframe
a. 800,000 years ago to the present
Which of the following describe what happened to Earth’s temperatures during this time period.
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a. temperatures only increased
b. temperatures only decreased
c. temperatures increased and decreased several times