38. Look at the 2015 Hardiness Zone Map of the United States at the end of this exam.
A. What is the number of the hardiness zone for Chicago?
B. What is the range of the average annual low temperature for Chicago?
C. Compare the 2006 and 2015 maps at the end of this exam. What changes in the hardiness
zone maps does this information show?

A. The city of Chicago, of the state of Illinois, is in the hardiness zone number five.

B. To calculate range, we take the lowest values and subtract them from the highest values. In this case, Chicago is in the hardiness zone number 5, which places its annual low temperature from 0 Fahrenheit degrees to -10 Fahrenheit Degrees.

The range is 10.

C. The changes to the hardiness zone maps are very crucial. They show the changes in climate relevant for plant survival and growth. The changes that are seen in the maps show that the United States has become warmer. It will become more difficult to plant trees and other plants crucial for humans in future generations if such pattern continues.