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View Resource Dimensions of the Earth

This unit consists of a variety of materials that explain the shape of the Earth and how it is measured. There is a set of 'proofs' that the Earth is round, an account of how Greek geographer and mathematician Eratosthenes deduced that Earth's surface was curved, and explanations of how roundness, latitude, and longitude are measured. There is also information on time zones, contour (isoline)...

View Resource Telescopes from the Ground Up

This tutorial traces the history of the telescope, beginning with Galileo's first small refractor, to the era of orbiting space telescopes. Topics include Galileo's trouble with the church over the observations he made with his new instrument, Sir Isaac Newton's invention of the reflecting telescope, and the development of technologies that made it possible to construct increasingly larger, more...

View Resource Earthquake History of California

This article describes major earthquakes that have occurred in California since the colonial era, beginning with a 1769 earthquake experienced by a Spanish expedition near what is now Los Angeles, and ending with the July 1952 earthquake in Kern County. Each account provides observer's reports of injuries, fatalities, property damage, and ground effects (cracking, subsidence). More recent...

View Resource The Chesapeake Bay Bolide: Modern Consequences of an Ancient Cataclysm

This report provides an overview of the Chesapeake Bay bolide and how it influenced the formation of the modern bay. Introductory material discusses what a bolide is, types of impact craters, and recent impacts that have generated public interest. The discussion continues with evidence of the late Eocene Chesapeake Bay impact, including seismic data, characteristic minerals, and the discovery of...

View Resource NOAA History

An extensive collection of profiles, stories, and pictures documenting 200 years of the National Oceanic & Atmospheric Administration. Site contains biographical sketches, sea stories, art and poetry, and more from NOAA and its ancestor agencies. Explore the changes in vessels and instrumentation that first surveyed the United States and its waterways in the 1800s through the present day. Site...

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