Chapter 1 Answers

Review Question Answers:

1. An observation is a measurement, while an evaluation is an interpretation (or opinion) of the measurement. For example, an observation, my cat is purring, and an evaluation, my cat is purring because he likes me.
2. The x-axis represents years from 1880 to 2010. There are two y-axes, the left y-axis is global temperature expressed in degrees Celsius and the right y-axis is the CO₂ concentration in parts per million (ppm).
3. No, to determine an exact position you need both the latitude and longitude.