Los Ciclos de la Tierra

El Ciclo Hidrológico: El viaje del agua a través del tiempo

por Anne E. Egger, Ph.D.

Para Seguir Explorando

Water Resources of the United States

US Geological Survey - Extensive information on water resources, quality and hazards including storm and flood data.

The El Nino Theme Page

A comprehensive website from the National Oceanic and Atmospheric Association (NOAA).

Watershed Resource Inventory

Environmental Protection Agency (EPA) - A compilation of resources important for watershed protection and restoration, including the condition of water resources, vulnerabilities, and human health.


John Tyndall photo

John Tyndall

Tyndall Centre for Climate Change Research


Address Delivered Before the British Association Assembled at Belfast

John Tyndall's 1874 address to the British Association, advocating for rationalism, skepticism, and consistency in science.

Noticias & Eventos

Black carbon creates droughts and floods in China


Current Science News

News from around the world of science.

US Global Change Research Program

Research report from the Water Cycle study group

Google Scholar

Google - Research database allows searching of the scholarly literature.


Bering Land Bridge animation

A movie showing sea level change over the past 10,000 years, created by INSTAAR at the University of Colorado.

Follow the water molecule

Trace the path of a raindrop as it moves through the hydrologic cycle.

Investigating the Precipitation-Streamflow Relationship

Step-by-Step Guides for Investigating Earth System Data from Earth Exploration Toolbook.

Next Generation Science Standards: For States, By States

National Academies Press: A Framework for K-12 Science Education