53. The graph models the linear relationship between the temperature of Earth's
atmosphere and the altitude above sea level.
Earth's Atmosphere
у
1 2 3 4 5 6 7 8 9
Temperature (°C)
20
10
0
-10
-20
-30
-40
-50
-60
Altitude (km)
Which of these best represents the rate of change of the temperature with
respect to altitude?