SEGway home > for educators > sun-earth > about Graphing Stratospheric Ozone > detailed learning objectives Graphing Stratospheric Ozone Detailed Learning Objectives Objectives relate to National Science Education Standards, and can be used as a tool for student assessment. Graphing students should be able to: interpret false-color TOMS images of total ozone pressure Construct a graph of data from image points, with proper scale notations, e.g. Pressure vs. time for a given latitude and longitude Pressure vs. altitude at a given time Define the Dobson Unit and describe its use Ozone Chemistry students should be able to: Describe and discuss one or more of the following: Cyclic changes in the depth/density of the Earth's ozone  layer The chemical interaction of the ozone layer with sunlight Changes in the ozone layer due to human activities ©1998 The Regents of the University of California Have a science question? Visit our Ask an Expert page. Email questions or comments about SEGway resources to:outreach@ssl.berkeley.edu