Listen to various different types of earthquakes, and compare the sounds of various earthquake events.

This resource provides information about earthquakes, including how they are measured.

Hyperlinked diagram provides an in-depth explanation of each phase of the Earth's water cycle.

What is a sinkhole? Where are they found? What causes them? This text based article will provide the answer to these questions, and more!

An interactive, real-time map showing current earthquakes happening all over the world. Students may choose options for which earthquakes to display by age, depth, magnitude, or intensity.

This site provides a lesson plan in which students will learn to use north, south, east, and west to identify relative locations and provide directions.

Information from USGS about the Haleakala Crater and the East Maui volcano, including the volcano's eruptive history, maps of the crater, and geologic data sets.

This activity has students access USGS earthquake information to plot the their locations on a world map. Doing this will help students discover for themselves the boundaries of tectonic plates.

The USGS offers detailed information on Types of Cartograms, Congressional Districts, Software for Cartograms, Publications, and a Carto-Gallery.

In this interactive activity adapted from the USGS Alaska Science Center, students will track the movements of a polar bear as it migrates across the changing Arctic sea ice and compare the paths of four different polar bears.

General information on the importance and use of a streamgage to measure and record the water level in a river.

Mercury in the geochemical cycle ultimately affects the food chain. Learn about this and its effect on the Everglades.

This site, which is provided for by the U.S. Geological Survey, describes the volcanoes in the Cascades.

General information about the consumption and mining of gold.

The information in this publication provides an introductory primer on understanding basic scientific facts about landslides-the different types of landslides, how they are initiated, and some basic information about how they can begin...

30 fun facts are presented to commemorate the 30th anniversary of the 1980 eruptions of Mount St. Helens.

This report from the U.S. Geological Survey uses illustrations to show how water moves through an aquifier and also how water is obtained from the ground.

This site provides a detailed report on floods and flood plains. Facts about weather patterns, zoning restrictions, and dams and levees are given along with diagrams and photos.

Fact sheet uses graphs to highlight streamflow data collected after major floods.

General information about droughts includes how to determine when a drought begins and what areas of the United States they are most likely to occur.

This is a good resource for anyone who wants to understand the historical development that led to our understanding of relative dating. This site also has links to index fossils and a table of geologic time.

If you need examples of index fossils for each of the geologic eras and periods, than this resource is for you. Diagrams of the index fossils and their scientific names are also provided.

This is a good source for getting an in-depth description of using radioactive decay to measure the ages of rocks. In addition to describing the process of radiometric dating, this resource also includes a geologic time scale and four...

Are zebra mussels edible? What do they eat? How big do they get? These are just a few examples of the types of questions that are answered in this thorough site.