In this chapter, students investigate Earth’s atmosphere, beginning with
a study of the hydrologic cycle. They examine how factors such as pressure,
saturation, and air density contribute to weather. Students are introduced
to concepts of air masses and the ways these masses interact to produce
weather. Students examine patterns, using them to make predictions and forecasts
about weather conditions. This free selection includes the Table of Contents, Introduction, Correlations with National Science Education Standards and Benchmarks for Science Literacy section, and the Index.