Users download and analyze satellite images showing the amount of ozone in the stratosphere. They interpret the images to identify the ozone "hole" that develops over Antarctica each summer, and compare its size from year to year. Using freely available image analysis software, ImageJ, users quantify the area of the Antarctic ozone hole each October from 1996 to 2004. Finally, they bring their measurements ... Full description.

The purpose of this activity is to learn how contour maps can be made by hand. Students plot data from GLOBE schools on a map with latitude and longitude lines and draw contours based on the values plotted. A suggested extension and how to use this activity as an assessment is included. Full description.

This resource provides guidance on site selection for the GLOBE Atmosphere data collection protocols. Instructions for building an instrument shelter, a snowboard, an ozone measurement station, and a wind direction instrument are included. Full description.

The purpose of this resource is to have students learn to use the hydrology instruments and collect the hydrology data accurately. In the classroom, students practice using the instruments or kits for protocols, exploring the range of measurements and sources of variation and error. Full description.

The purpose of this resource is to define a soil characterization site. The following factors are defined: location, latitude, longitude, elevation, aspect (the direction of the steepest slope across an exposed soil site) and landscape position and slope (describes the contours of the land at the soil characterization site). Full description.

The purpose of this resource is to determine the latitude, longitdue, and elevation of your school and of all your GLOBE sites. The GPS receiver will be used to determine the latitude, longitude and elevation of your school or of your GLOBE sites. Full description.

The purpose of this resource is to introduce students to the concept that sometimes there is no one "right" answer to a question or measurement. Students learn to be careful when searching for a right answer to questions such as 'What time is it?' by comparing multiple measurements of the time of day. Students gain an intuitive understanding of the characteristics of imperfect measurements. Using ... Full description.

The purpose of this resource is to investigate the center pixel of a homogeneous land Cover Site in order to understand that individual land areas are part of a larger land system. Full description.

The purpose of this resource is to investigate the idea that every dynamic system has energy and matter in different forms. Full description.

The National Atmospheric Deposition Program monitors wet atmospheric deposition (chemical constituents deposited from the atmosphere via rain, sleet and snow) at over 220 National Trends Network sites throughout the United States. This site contains a long-term, high-quality database of atmospheric deposition for research support in the areas of acid rain, air quality, water quality, agricultural ... Full description.