System requirements: the map pages require the use of Microsoft Internet Explorer 4 or 5, or Netscape Navigator 4 or 5; a screen resolution of at least 800 by 600 pixels is highly recommended; multimedia maps require Shockwave, a Web browser plug-in that can be downloaded from this Web site; sound card for audio. Mode of access: Internet.
Relief shown by shading, contours, and gradient tints. Title from home page (viewed on Mar. 12, 2002). Developed by the U.S. Geological Survey and other federal government agencies.