The purpose of this resource is to measure the amount of oxygen dissolved in water. Students use a dissolved oxygen kit or meter to measure the dissolved oxygen in the water at their hydrology site. The exact procedure depends on the instructions in the dissolved oxygen kit or meter used. The meter requires calibration before use. Full description.

The purpose of this resource is to measure the pH of water. Students use either a pH meter or pH paper to measure the pH. If using the pH meter, the meter needs to be calibrated with buffer solutions that have pH values of 4, 7, and 10. Full description.

These three lessons focus on the effect of fluctuations of temperature on aquatic life. Topics include effects on the growth and survival rate of aquatic plants, how the metabolic rate of clams is affected by a change in temperature, and the optimal temperature for the hatching and development of brine shrimp eggs. Full description.

Thousands of people in the Andes mountains of Peru are having their lives affected in both a practical and cultural way by climate change, which is causing the region's glaciers to melt. This document explores the causes of the glacial melt and its impacts on the local cultures. Full description.

In this lesson, students assess the causes and effects of massive arsenic contamination in the water supplies of 43 of Bangladesh's 64 districts. Students evaluate why this contamination occurred, how it affects the population of Bangladesh, and why this environmental catastrophe is proving so difficult to solve. Full description.

This module engages students in the use of a clean room and in the planning of assembly of solar collector wafers for the Genesis space mission. They will work in production design teams to explore how the Genesis spacecraft will collect bulk solar wind with the collector arrays and learn to work as a team in a restrictive environment. The module includes several activities with accompanying video ... Full description.

The purpose of this resource is to have students use GLOBE data and graphing tools to compare the influence of latitude, elevation, and geography on seasonal patterns. Students analyze the graph of the past year's maximum and minimum temperatures at their site. They compare this graph to similar graphs for two other sites and list which factors that might cause the patterns to be different and investigate ... Full description.

The purpose of this resource is to measure the temperature of a water sample. Students use an alcohol-filled thermometer or meter to measure the temperature of water. The meter requires calibration before use; the accuracy of the thermometer needs to be checked before use. Full description.

The purpose of this resource is to determine the transparency of water. Students measure water transparency at their undisturbed study site using a transparency tube or Secchi disk. Full description.

The purpose of this resource is to measure soil water content by mass. Students collect soil samples with a trowel or auger and weigh them, dry them, and then weigh them again. The soil water content is determined by calculating the difference between the wet sample mass and the dry sample mass. Full description.