Students study airforce aircraft.  In this investigative lesson students discuss an article they read and divide into groups and design three different combat or peacekeeping situations. 

Students discover the differences between weather and climate in this long-term instructional activity introduction. They create rain gauges and practice reading rainfall measurements, view a website showing the cloud cover in their...

Students recognize that plants and soils have a close relationship. They view a photo essay on the common practice and natural process of composting. Afterwards, they observe the process of plant decay over the course of several days.

Through illustrated examples and interactive practice, students explore Newton's ability to relate the cause for heavenly motion (the orbit of the moon about the earth) to the cause for Earthly motion (the falling of an apple to the...

College-level planetary science course highlighting modern navigation. Course introduces the concepts and applications of navigation techniques using celestial bodies and satellite positioning systems (GPS). Course features include...

The practice problems and illustrated examples in this tutorial help students understand the acceleration of gravity. The 'Value of g' widget the tutorial refers to can be found in the Interactives section (link is in side-bar) under...

Read about the surprising and swift collapse of the Soviet Union and its satellite countries beginning with Poland in 1989. Watch a map which shows the change from a single country, USSR, into many independent countries, and find out...

The Amazon River rises each year from December to May, forcing fish to flow through the tops of trees. Learn how satellites and technology track the rising and fall of the Amazon River and how this affects the rain forest.