The early 1970s saw South Bronx property values continue to plummet to record lows. As the sun sets in the summertime, temperatures plummet dramatically, sometimes upwards of 30 degrees. Consequently, many homes were foreclosed, causing the housing market to plummet. Arlo protects Spot as the two plummet down the fall, and carries him to shore. Temperatures typically plummet during summer nights, with an average diurnal temperature variation approaching . However, temperatures can plummet to during the winter months. After a tearful farewell, Mama and Lily plummet off the cliff. Suddenly, the radiation levels plummet and a familiar roar is heard. Since the population all consumes oxygen the dissolved oxygen levels will plummet. Roof tilers plummet down and break in two. Laboratory simulations show that whenever multiple lethal factors are combined, the survival rates plummet quickly. Ultimately both of them plummet towards Earth, critically injured. Since the population all consumes oxygen the dissolved oxygen (DO) levels will plummet. Farmers saw their production of cotton plummet by as much as 90 percent. Ratings for the program began to plummet.