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National Science Education Standards:
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1 to 2 hours  
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In this textbook chapter, students are introduced to Mendelian inheritance and the biological processes through which changes in DNA are created and propagated within a population. An activity teaches students about dominant and recessive alleles,... (View More)

Audience: High school
Materials Cost: Free

This textbook chapter describes the processes through which El Niño and La Niña conditions emerge. The resource includes an animation of ocean currents, and links to current news articles, and a suite of pre- and post-unit assessments. A teacher's... (View More)

In this activity, students compare and analyze lapse rates (rate of decrease in atmospheric temperature with height) for two U.S. locations. It requires the use of atmospheric temperature data downloaded from the Internet into a student developed... (View More)