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The nature of science  
Earth structure  
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This video provides a step-by-step guide to determining nitrate and nitrite concentrations in a water sample, using a nitrate testing kit. It describes what chemical reactions are taking place throughout the testing process. The resource includes a... (View More)

This video demonstrates students locating and preparing a study site where they can conduct field observations. The procedure used when describing a soil profile is outlined. The properties of soil are described, including the structure, color,... (View More)

This video provides step-by-step instructions for collecting soil samples in the field, and for analyzing and storing soil samples in the lab. Procedures for determining the bulk density, particle density, particle size distribution, fertility, and... (View More)

This video describes how to select a soil moisture study site and sampling strategy, and identifies what laboratory instruments will be needed to complete a soil moisture analysis. Students are shown collecting soil moisture data and asking... (View More)

This video introduces the measurement of dissolved oxygen in a water body as an important indicator of ecosystem health, and demonstrates students analyzing a water sample for dissolved oxygen. The resource includes a video and a written transcript,... (View More)

This video demonstrates students measuring the acidity of water, using pH indicator paper and a pH meter. The resource includes a video and a written transcript, and is supported by the Water pH Protocol in the GLOBE Teacher's Guide. This is one of... (View More)

This video demonstrates students measuring the alkalinity of a water sample, using an alkalinity test kit. The resource includes a video and a written transcript, and is supported by the Alkalinity Protocol in the GLOBE Teacher's Guide. This is one... (View More)

This video describes how to select a soil infiltration study site, and demonstrates procedures used when taking soil infiltration in the field. Instructions for fabricating a necessary piece of field equipment, a dual-ring soil infiltrometer, are... (View More)

This video highlights students taking scientific measurements to support investigations in atmospheric science, hydrology, soils, and land cover. It shows students reporting data through the Web, creating scientific visualizations for analysis, and... (View More)

This video highlights students taking scientific measurements to support investigations in atmospheric science, hydrology, soils, and land cover. It shows students reporting data through the Web, creating scientific visualizations for analysis, and... (View More)