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- Why are the rocks and plant communities of Roan Mountain interesting to natural scientists?
- In Roan Mountain Highlands, page 2
- The rocks of Roan Mountain are interesting because of their age, their mineralogy, and the evidence they provide about the geological processes that formed them. The plant communities are interesting because they are southern examples of communities usually...
- By Dirk Frankenberg and Jennifer Godwin-Wyer.
- Sculpted stone wall at Teotihuacan, Mexico

- A stylized stone snake head emerges from a heavily-carved low wall. The wall connects to a taller wall made of stone blocks. Teotihuacan is the name of a Mesoamerican indigenous civilization and its grandest city, once the largest city in Mexico. The civilization...
- Format: image/photograph
- Central plaza of Teotihucan, Mexico

- A low stone square sits in the middle of a large central plaza. Multiple ruins of stone buildings line the plaza as well as both sides of a long straight road that extends into the distance. A mountain range rises beyond the city. Teotihuacan is the name of...
- Format: image/photograph
- Carved stone wall in Teotihuacan, Mexico

- A carved stone animal head emerges from a stone wall. The head emerges from a base that is similar to a flower. A metal rod is supporting the head. Teotihuacan is the name of a Mesoamerican indigenous civilization and its grandest city, once the largest city...
- Format: image/photograph
- Glyphs inTeotehuacan, Mexico

- Stylized animals and geometric patterns are carved into a pink stone close to the floor. Many pre-Columbian cultures in the Americas used glyphs as a form of written language. Historians and archaeologists know more about the Maya and Aztec glyph languages,...
- Format: image/photograph
- Pyramid of the Sun in Teotihuacan, Mexico

- A very large stone pyramid rises from a grass field. The pyramid is composed of several different levels, with stairs leading from level to level. The Pyramid of the Sun is the largest structure in Teotihuacan, and the second largest in Mesoamerica. It is...
- Format: image/photograph
- Steps on a Teotihuacan, Mexico

- Two tourists stand among steep-sided pyramid walls. A metal rail separates two pyramid walls. Overcast skies frame the image. Teotihuacan is the name of a Mesoamerican indigenous civilization and its grandest city, once the largest city in Mexico. The Teotihuacan...
- Format: image/photograph
- Pyramid of Moon in Teotihuacan, Mexico

- A large stone pyramid is photographed from the perspective of the top of a different pyramid. The pyramid in the distance is constructed of multiple levels with many stone stairs. Teotihuacan is the name of a Mesoamerican indigenous civilization and its grandest...
- Format: image/photograph
- Sculpture in Teotihuacan, Mexico

- A small sculpture emerges from a stone wall. The sculpture is made up of three parts: two white conical images, with a small red bowl between them. The conical carvings may represent shells. Teotihuacan is the name of a Mesoamerican indigenous civilization...
- Format: image/photograph
- Avenue of the Dead in Teotihuacan, Mexico

- Three tourists walk down the middle of a dirt street between several very tall stone pyramids. The pyramids are constructed of various levels with steep stairs. Teotihuacan is the name of a Mesoamerican indigenous civilization and its grandest city, once the...
- Format: image/photograph
- Tuff Canyon near the Castelon area of Big Bend National Park

- This photograph shows the Tuff Canyon Cliff near the Castalon area. Tuff is “a rock composed of consolidated or cemented volcanic ash.” These gray cliffs show a great deal of erosion from Blue Creek as it cut through the rock. Strewn at the base...
- Format: image/article