1. Work your way systematically through the following topic menus:
   • Introduction
   • Understanding The Basics
   • How High Can The Water Get?
2. On each web page that the purple buttons take you to:
   • Follow all the links.
   • Carefully read and understand all the material.
   • Perform all the tasks.
   • Answer all the questions.
   • Make use of all the answer-checking devices.
3. Remember, only use the smaller, red, yellow or green buttons to find your way back to specific topics. They are not a substitute for the purple buttons.

WHAT YOU HAVE TO SUBMIT: There is nothing to submit.