This resource covers components of the hydrologic (water) cycle. Although it is geared to high school level, middle school students could grasp the content with assistance from an instructor. Specific topics include the distribution and movement of water in the Earth system, such as evaporation, transpiration, condensation, precipitation, runoff, and ground water. Full description.

This site is devoted to microscopic images of minerals, thin sections of rocks and meteorites, and stereoscopy of minerals. The site is organized into the following categories: meteorites, plutonic rocks, volcanic rocks, carbonates, sedimentary rocks, sedimentary rocks and diatoms. Other links include conoscopic images, an index measurement page containing theoretical information about index of refraction ... Full description.

This web site includes almost 200 photomicrographs of rocks and minerals. The thin sections are all in transmitted white light, some in plane polarized light, but most with crossed polarizers on. The majority of the pictures show a field of view 1.5 mm long (about 80X magnification). Other magnifications are indicated where different. The thin sections are categorized into minerals, igneous, metamorphic, ... Full description.

This is a collection of photomicrographs of igneous rocks. There are 69 photomicrographs with captions containing pertinent information. This resource is part of the Teaching Petrology collection. http://serc.carleton.edu/NAGTWorkshops/petrology03/index.html Full description.

This page is a collection of photomicrographs of metamorphic rocks. There are 45 photomicrographs with captions containing pertinent information. This resource is part of the Teaching Petrology collection. http://serc.carleton.edu/NAGTWorkshops/petrology03/index.html Full description.

This site contains photographs of 22 igneous rock hand samples. Clicking on an image brings up a larger view of the sample. In addition, links to thin sections are available for some of the samples. Thin sections can be seen in both crossed polarized light and plane polarized light by moving the cursor on and off the photomicrograph. This resource is part of the Teaching Petrology collection. http://serc.carleton.edu/NAGTWorkshops/petrology03/index.html ... Full description.

This site contains photographs of 18 metamorphic rock hand samples. Clicking on an image brings up a larger view of each sample. Images of thin sections are available for some of the samples. Thin sections can be seen in both crossed polarized light and plane polarized light by moving the cursor on and off the photomicrograph. This resource is part of the Teaching Petrology collection. http://serc.carleton.edu/NAGTWorkshops/petrology03/index.html ... Full description.

This site features Flash animations that illustrate various facets of the rock cycle. The visualizations depict rock-forming processes, such as erosion, transportation, deposition, cementation, crystallization, subduction, and eruption, that create sedimentary, igneous, and metamorphic rocks. They also show cooling environments that result in varied crystal sizes and demonstrate igneous rock classification. ... Full description.

This web site includes almost 200 photomicrographs of rocks and minerals. All photographs are of thin sections ground to .03 mm thickness, in transmitted white light. Some show the appearance of minerals in plane polarized light, but most were taken with crossed polarizers on a petrographic microscope, better to illustrate mineral properties and rock textures. The majority of the pictures show a field ... Full description.

This site contains slide shows and virtual field trips of Yellowstone National Park. There are several slide shows to chose from, including wolves of Yellowstone, bear research, fire ecology, the history of Yellowstone and the influence of art on Yellowstone Park. Each program features slides containing text and photographs. There is also an orientation slide show about the National Park system. More ... Full description.