This site is all about snow crystals and snowflakes. The many facets of snow crystals are described here, along with attempts to understand their formation. This site includes collections of super-high-resolution snow crystal photos, as well as links to learn about snow crystal classifications and how to make snow crystal fossils. Included in the study of how snow crystals form, these researchers ... Full description.

This chapter of the GLOBE Teacher's Guide presents information on how to characterize soil profiles and measure soil moisture and temperature. K-12 students from all over the world are participating in the Global Learning and Observations to Benefit the Environment (GLOBE) program by taking environmental measurements at their schools and sharing their data via the Internet. Measurement protocols and ... Full description.

This field activity has two parts: Elementary school students are asked to draw and verbally describe clouds and are given web access to cloud pictures. High school students are taken outdoors to describe cloud height, shape, and cover; and wind speed before answering questions. The activity is part of the Atmospheric Visualization Collection (AVC), which focuses on data from the Atmospheric Radiation ... Full description.

This site explains what soil is and why it is important, describes some of the organisms that live in the soil and how they interact to provide food for plants and for each other, illustrates the food cycle, and provides soil facts in different contexts. There is an Adopt a Soil Critter section and a soil quiz. Activities include coloring, collecting bugs, observing soil color and texture, and making ... Full description.