Regents Earth Science Test Preparation Practice

    The Atmosphere


    Base your answers to questions 12 on the geologic timeline below and on your knowledge of Earth science. The geologic timeline, drawn to scale, represents Earth’s geologic history. The letters A through H on the timeline represent the times of occurrence for specific, labeled geologic events. The time of occurrence for letter A has been omitted.

    geologic-history, reference-tables, earth-history, evolution-of-life-forms-and-the-free-oxygen-in-the-atmosphere, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci12017-examw_g32.png


    Base your answers to questions 13 on the data table below and on your knowledge of Earth science. The data table shows the average level of atmospheric carbon dioxide (CO2), measured in parts per million (ppm), for the month of February at the Mauna Loa observatory in Hawaii from 2008 to 2014.

    climate, climate-alterd-by-natural-events-and-human-influences, standard-1-math-and-science-inquery, eccentricity-rate-gradient-standard-error fig: esci12017-examw_g34.png


    Base your answers to questions 14 on the data table below and on your knowledge of Earth science. The data table shows how the destruction of the ozone layer in Earth’s atmosphere has affected the amount of ultraviolet radiation reaching Earth’s surface beneath the areas of ozone destruction.

    insolation-and-the-seasons, variations-of-insolation, standard-1-math-and-science-inquery, eccentricity-rate-gradient-standard-error fig: esci12019-examw_g49.png


    Base your answers to questions 15 on the passage and graph below and on your knowledge of Earth science. The graph shows changes in the amount of chlorofluorocarbon production, in tons per year (T/y), by some countries over a 10-year period.

    CFCs and Ozone

    CFCs (chlorofluorocarbons) are chemicals that threaten to destroy stratospheric ozone. CFCs were first manufactured in 1928 to be used as chilling agents in refrigerators. In later years, they were used for cleaning electrical circuit boards and to make foam for insulation. Unfortunately, scientists found that these chemicals escaped into the atmosphere and rose to the stratosphere. In the stratosphere, intense ultraviolet (UV) radiation broke the CFCs down, producing chlorine, a gas that reacts with and destroys ozone. In 1974, two scientists identified the depletion of stratospheric ozone from the release of CFCs. After this discovery, 27 countries agreed to reduce production of CFCs, because ozone in the stratosphere protects all life from the Sun’s most damaging UV rays.

    reference-tables, properties-of-common-minerals, climate, climate-alterd-by-natural-events-and-human-influences, meteorology, the-atmosphere, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun fig: esci12020-examw_g34.png