All questions carry equal weight.
Answers should be 1 to 3 complete sentences and should fit in the space provided. Name 3 atmospheric pollutants found in large amounts in a city like Phoenix, Arizona. Name two 20th century meteorological instruments that are essential in the forecasting of tornadoes and severe thunderstorms. Describe the mean climate during the 13th and 14th centuries. Name the three parameters that define the Earth's orbit around the sun and were used to explain the ice ages.