Water pollution is the contamination of water resources by harmful wastes or toxins. This type of pollution can be dangerous to animals and plant populations in and around lakes, rivers, polluted groundwater areas or oceans, and can pose...

College-level instructor's notes on how animal body plans have changed over time through the process of evolution.

Resource gives an introduction to U.S. Monetary Policy and an explanation of The Federal Reserve System (the Fed) through a series of question subheadings.

This page contains a brief biography of gold rusher, John Sutter, from the book "Life in California before the Gold Discovery" by John Bidwell.

Written by James Hutchings in 1853, the ten commandments of miners show the life of the miner.

Published in "Hutching's California Magazine" in 1857 was a song expressing the hopes and dreams of those suffering from gold fever.

An 1890 article in "Century Magazine" by Guadalupe Vallejo relates his understanding of Hispanic influences on ranches and missions that existed in California before it became a state.

Provides biography of an African American 49er with first hand accounts.

Provides the history of the Golden Gate bridge with some interesting facts.

Detailed information and fascinating facts about the Madagascar hissing cockroach include diet, habitat, physical features, behavior, and conservation status.

Learn fascinating facts about the white ibis along with detail about physical characteristics, habitat, diet, social behavior, and conservation status.

This outstanding multimedia website follows the San Andreas fault system up the California coast from San Diego to just north of San Francisco on the coast.

Discover the incredible Hearst Castle nestled in California's San Simeon hills about midway between San Francisco and Los Angeles. The castle, built by William Randolph Hearst, of Hearst Publishing, in 1947, stands majestically on 127...

Extremely well-written, attention-holding account of Bret Harte. Great site!

Series of interactive online grammar quizzes divided into 12 chapters (intended to accompany text "Allons-y" but text not necessary). Each chapter is divided into various concepts and provides a short, self-correcting test - several in...

Are you prepared for a major disaster or emergency? Would you know what to do until you could get help? Find out how to prepare yourself ahead of time by building an emergency supply kit and also what to do in a specific disaster such as...

The USGS provides an extensive section of information about tsunamis. The items presented are the basics of tsunamis regarding the Great San Francisco earthquake of April 18, 1906, tsunamis in the U.S. Pacific Northwest, and the 1998...

View the media-rich work of teams of student journalists assigned to produce high-interest feature stories using pictures, audio, and words. Learn how to tell a story well by thinking critically about the different choices made by each...

View 21 panoramic photos from the National Archives collection that feature images of natural disaster sites, major construction projects, military units, and the like.

A broad selection of images featuring the 1906 earthquake in San Francisco can be found on this site by Calisphere. By clicking on individual images you'll find high quality photographs and image information.

This is the text of Franklin D. Roosevelt's speech to the Commonwealth Club on September 23, 1932, in San Francisco, California.

Can you figure this? If it is afternoon in San Francisco, California, what time is it in Cairo, Egypt? Explore positive and negative number values in this one page activity using time zones from different parts of the world.

Identify all the information you want to know about Candlestick Park, home of the San Francisco 49ers. Includes interesting facts and details about the facility and team, history of the venue, and news.

From Ulysses S. Grant's memoirs is this description of his 1852 trip to California across Panama and his stay in San Francisco.