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...

Besides serving as awe-inspiring monuments of human achievement, skyscrapers are built to perform a wide range of functions in urban communities. The second lesson in this series begins by exploring the history of the Empire State...

Learners explore the relationship between greenhouse gases and global warming. Carbon dioxide is studied as a contributor to the problem.