"The Missing Link"

Abstract: Scientists use a variety of instruments in order to measure an item of their interest. However, validation of the data is almost as important as the information itself. Therefore, this lesson interacts with the web to show students how a scientist takes data from an ozone measuring satellite (TOMS) to see if it is reasonable. Then, students will investigate how "missing" data is acquired.

Outcomes: By the end of the full activity, the students should be able to:

- explain why validation is important in science
- explain how total global ozone data is recorded on the ground
- access global ozone ground data for any city and date on the web
- recall the satellites used to measure ozone
- explain how satellite measurements are compared to ground measurements
- access satellite data on total ozone amounts over the internet
- explain how missing data points are extrapolated and validated

Suggested Grade Level & Duration: 9-12

one or two 40-minute class periods (based on individual need)

Materials needed:

Computer access to the web.
A printed ACTIVITY SHEET or WEB ANSWER SHEET (if you do the lesson online).
A classroom clock, and a few other watches or clocks