One lake in Germany killed everything that swam in it, drank from it, or flew over it providing scientists with an incredible fossil record and a huge mystery. PBS Eons explains the rarity of the fossil finds including turtles in the...

Ice cores provide scientists with knowledge of historic melt layers, air temperatures, greenhouse gases, and climate stability. Scholars work in groups to build layers representing snow and ice over thousands of years. Then, groups...

The Gulf of Mexico dead zone, an area of low oxygen that kills marine life, costs the United States $82 million every year. Young scientists research anoxic ocean environments then come up with a hypothesis for the cause of the Gulf of...

Turn your class discussion of rock formation from ho-hum to holy hornfels! Junior geologists gain experience in identifying rock types and rock origins, with an emphasis in hypothesizing the environment needed to form certain rocks. The...

Epithelial tissues plays a variety of roles in the human body, including covering, lining, making a barrier, protection, excretion, filtration, absorption, and sensation. The video teaches high schoolers about epithelial tissue and its...

The arctic seas contain currents that are both warm (with high salinity) and cold (relatively fresh water) that circulate throughout the year. Through discussion, a lab, and a web quest, participants explore the impacts of melting and...

Use the classic density demonstration of placing a cola, a clear soda, and a diet soda into a tank of water. Then let learners attempt to pour some of the soda into layers in a clear container. The procedure explains a thermocline, and...

Students experiment with different salinities of water using straws and different colors of water. They collect and interpret data from the experiment.

Students set up working models demonstrating lake turnover and the formation of deep water masses in the oceans.

Students view an illustration of the Hudson River watershed and identify the bodies of water shown. They discuss what happens when fresh and salt water mix. Students view a teacher demonstration of the stratification of fresh and salt...

Students study the process of stratification and seed dormancy.  In this germination instructional activity students prepare a medium in which to grow  seeds.

Students examine why sandstone has stripes. In this sedimentary rock instructional activity, students investigate the process of stratification. Students will view images of Petra and engage in a hands on activity that shows how...

Sixth graders research Lake Superior and its ecosystem. Students investigate the lake's cycles of mixing and stratification and how these cycles affect the biology of the lake. This lesson plan contains five days of activities.

High schoolers use video, research and experiments to investigate and replicate thermal stratification in a lab. They prepare a report, poster or multimedia presentation showing the results of their work.

High schoolers explore temperature variation in lakes and deal with the data.