After clicking on the Geology Tour button you will see the
following page: The 3-D image collection has been divided into
six categories, represented by the six postcards labeled
Atmospheres, Volcanos, Exploration, Craters, Faults, and Rivers.
To browse the 3-D image collection for a particular category,
you may click anywhere within that category's postcard. The 3-D
button in the lower-lefthand corner provides easy access to the
3-D Tour of the Solar System home page. If you click on
Volcanos, you will see the following page: A brief introduction
to Volcanos on the Planets is followed by a list of the various
subcategories available for this section. You may click on a
subcategory title to go directly to that part of the 3-D image
collection, or you may manually scroll through the entire
Volcanos section using the scrollbar found along the righthand
side of your browser window. The Home and Geology Tour buttons
provide a shortcut to these popular menu pages. Your browser's
Back button may also be used to ret