Young scientists roll up their sleeves and get a little dirty in this three-day earth science investigation. Following the scientific method, children monitor the growth of algae in pond water samples in order to determine...

Test your knowledge of biogeochemical cycles.

Test your knowledge of the water cycle, carbon cycle, and nitrogen cycle.

This is a large collection of resources on cycles of nature and the Earth. There is a constant exchange of the elements between air, earth, water, plants, and animals. Most biological processes wind up back where they started. These...

Instructional module focusing on the nitrogen cycle. Discussion includes the requirement of nitrogen by all organisms, the five processes in the nitrogen cycle, and how humans impact this cycle. The site also includes an interactive...

Instructional module focusing on the carbon cycle. Discussion includes the biological and geological components of how carbon moves through the atmosphere, lithosphere, and hydrosphere. Site also includes an interactive practice quiz and...

Nitrogen, one of the most abundant elements in the universe, is essential to life. This interactive activity adapted from the University of Alberta provides an overview of the nitrogen cycle. Includes background reading handout and...

[Free Registration/Login may be required to access all resource tools.] Explains the cycle of carbon through the atmosphere, geosphere, and biosphere.

This lab uses a robust model of the carbon cycle to give an intuitive sense for how carbon circulates through the atmosphere, biosphere, oceans, and crust.

An interactive lab simulation demonstrates the effects of increased carbon in the atmosphere and how that increase contributes to climate change. A data table for student records is available for download.

Through interactive activities, reading exercises, and lab activities, students study how science, matter, energy, and systems are interrelated.