Maps

If coordinates are to be passed on to another person it is technically necessary to report the horizontal datum and the latitude/longitude of the point (e.g. NAD 27 CONUS, 44 degrees, 7 minutes, 30 seconds north/ 104 degrees, 15 minutes, 10 seconds west...
Generally, for the conterminous United States, the North American Datum (NAD) shift amounts to about 210 meters. This shift occurs because of the change in shape of the spheroid used to define the datum. The GRS 80 spheroid (used for NAD 83) is shorter...
The distances vary. A degree, minute or second of latitude remains fairly constant from the equator to the poles; however a degree, minute, or second of longitude can vary greatly as one approaches the poles (because of the convergence of the meridians...
The National Geologic Map Database Data Portal is intended to: 1) give the user a quick browse and query of our Nation's geologic maps, in a standardized format, and 2) link the user to the source information found via the NGMDB Map Catalog and Geologic...
An exhaustive database that provides bibliographic access to thousands of geologic, geophysical, and other kinds of maps available in USGS publications, Web sites, and in popular science journals.
As of mid 2014, more than 95% of the known historical USGS topographic maps have been scanned and are available for downloading or ordering. An additional 4% are in the process of being scanned and are expected to be available in early 2015. The index of...
Trails and symbols are shown clearly. A comprehensive legend appears on each map. Since each map is unique, placement of the legend varies. 
The USGS has some great science fair ideas related to earthquakes. Find inspiration for projects on other science topics by browsing the USGS Education website.
Absolutely! The USGS has partnerships with many citizen science programs that are appropriate for classroom projects or for individual students. These programs include:USA National Phenology Network (NPN)Project BudBurstNorth American Bird Phenology...
The USGS does not have any positions specifically targeted to teachers, but appropriate positions do exist. See the Careers and Opportunites page on the USGS Education Website to review sites that list volunteer or summer positions for students and...