This simple activity demonstrates how the ocean get its salt. Required materials are low cost and easy to obtain. Full description.

This coloring book is designed to help kids learn more about the valuable resources the U.S. Fish and Wildlife Service works to protect, restore and enhance. Each page, from A ('aquatic') to Z ('zones'), features a picture and information about a different aspect of the aquatic ecosystem, including animal and ecosystem characteristics. Full description.

As part of this classroom activity, students will record and graph temperature data to learn about the search for water on Mars. Using models of frozen and ice-free "soils" constructed from readily available materials (a list is provided), they will examine (by periodically measuring temperature and graphing the results) how the ice content of the Martian soil affects the rate at which a warm probe ... Full description.

This site offers information and hands-on activities to demonstrate how our rivers become polluted. Different types of pollutants and the mechanisms by which they can reach our rivers are documented. Ideas for classroom discussions about identifying and removing pollutants are also presented. Full description.

This activity integrates art and science as students use books and other sources to learn more about the creatures that live in the ocean. Once they have learned about various sea creatures and their habitats, they will construct an undersea environment in their classroom. Full description.

In this activity, students build a model illustrating the water cycle, and observe the results. The site includes a materials list, instructions, and information about the water cycle. A downloadable version is available, and the activity is also available in Spanish. Full description.

In this activity, students track a real winter storm, collect imagery and data, perform an analysis, and make predictions on the storm's path. They will summarize their findings by writing a press release for their local radio station or by producing a report with visuals and graphics for a television broadcast. Instructions for downloading and processing data, images, and weather reports are presented ... Full description.

In this classroom exercise, students will "build" a comet using representative materials. Learning outcomes, concepts, and a link to the comet "recipe" are provided. Safety tips, comet facts, and links to additional information are also included. Full description.

In this activity, students play the roles of investigators looking for the source of fuel that is contaminating wells in a fictional town. They will use a topographic map and information about groundwater flow and well locations to determine the source of the pollution. Questions help students understand how groundwater flows and how a contamination plume spreads over time. In an extension to the ... Full description.

In this activity, younger students enact the process by which precipitation (rain, snow, and hail) falls on an area and becomes standing water, run-off, or groundwater. They will learn general information about precipitation processes, aquifers, and the importance of clean groundwater. Full description.