Investigate the growth and development of New York City with the final lesson in this four-part series on skyscrapers. Learners first explore the concept of urban growth by looking closely at a series of three paintings made of Wall...

Give youngsters the components of a solar-powered electric circuit and turn them loose to figure out how to connect them in order for a light to shine or motor to turn. They compare energy output of a solar panel to that of a battery. On...

Ninth graders graph data in order to compare the number of extinct species and a rise in human population. They analyze the data collected. Students are encouraged to infer the relationship.

Ninth graders investigate biological systems. They summarize relationships between systems. Students determine how systems relate within the biosphere. They analyze the carbon cycle.