Crystal Morphology, Crystal Symmetry, Crystallographic Axes
This site is a lecture from Tulane University that explores the symmetry observed in crystals. Topics covered include crystallographic axes, the crystal lattice, and unit cells. Tables and illustrations accompany the text.
Twinning, Polymorphism, Polytypism, Pseudomorphism
This site is a lecture by Dr. Stephen Nelson from Tulane University that discusses the various nonstandard forms of crystal growth that are characteristic to some minerals. Topics include twinning (contact and penetration, polysynthetic and cyclical), the origins of twinning, and twin laws in the triclinic, monoclinic, orthorhombic, tetragonal, hexagonal, and isometric systems. Various types of polymorphism in many minerals are discussed as well as polytypism, metamict minerals, mineraloids, and
Stereographic Projection of Crystal Faces
This site features a lecture by Dr. Stephen Nelson from Tulane University that explores a systematic way to define crystallographic angles. The lecture discusses crystallographic angles and gives an introduction to the use of stereographic projections for depicting the angular relationships between crystal faces. Scientific illustrations clarify the text.
This site provides animations, images, interactive maps and videos that can be used to teach about the concept of geologic time. Visual resources cover some specific topics of earth history including plate tectonics, continental drift, relative age dating and paleontology. These resources are appropriate for an introductory level geology course.
This site features a collection of visual resources that can be used to help illustrate the process of physical weathering. Visualizations demonstrate different styles of mechanical weathering and the resulting impact on the landscape. Resources include animations, interactive graphics and photographs showing the effects of physical weathering. These visualizations are suitable for use in an introductory level geology lecture, lab, or other activity.
The Petrology of Sedimentary Rocks
This online version of a classic out-of-print sedimentary petrology textbook by Robert L. Folk is hosted by the Walter Geology Library at the University of Texas at Austin. The user can choose between high (PDF) and low resolution downloads of the textbook.
CLT: Exploring Climate Events and Human Development
This animation on the Climate TimeLine (CTL) site depicts changes in land cover due to land use over the past 100 years. Data is based on census data, tax records, land surveys, and historical geography estimates. This visualization is the work of the National Institute of Public Health and the Environment (RIVM, Netherlands) and the Center for Sustainability and the Global Environment (SAGE, USA).
Postglacial Flooding of the Bering Land Bridge
This geospatial animation shows sea level rising across the land bridge between Siberia and Alaska. During the last Glacial Maximum (~21,000 years ago), the Bering Land Bridge was a vast tundra plain connecting Asia and North America. At that time, the global sea level was 120 meters lower than it is today. Melting ice sheets and glaciers caused the sea level to rise and flood the land bridge. A QuickTime file of this animation can be viewed or downloaded for analysis, education and outreach. Th
Rock Cycle Animations
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. The animations can be paused and rewound to stress important points. These resources are
Atmospheric Pressure and Wind Animations
This site features Flash and QuickTime animations that illustrate diurnal changes in wind patterns along coasts due to unequal heating of the land and water, the Coriolis Effect on the Earth's surface and in the context of everyday weather patterns, and global circulation, temperature, and wind patterns. The animations can be paused and rewound to stress important points. These resources are suitable for use in lectures, labs, or other teaching activities.
Types of Maps
This site features Flash animations that illustrate temporal changes from remotely sensed images, and compare and contrast the benefits of using aerial photographs, topographic maps, and overlays of the two to identify spatial patterns. A third animation depicts the total sediment thickness of the world's ocean basins. These interactive resources are suitable for use in lectures, labs, or other teaching activities.
Using the Internet to Promote Inquiry-Based Learning
This site is an e-paper that describes a structured approach to inquiry-based learning using the World Wide Web as a primary information resource. Specifically, the paper addresses an 8-step process that begins with an essential question and ends with a product produced by students, typically completed in a cooperative setting. The paper also discusses the skills required by both student and teacher to make inquiry-based learning with the internet a successful endeavor. Finally, the paper discus
At a Crossroads: The King of Prussia Inn
recounts the history of this inn, built originally as a farmhouse in 1719 at an intersection of two roads northwest of Philadelphia, not far from Valley Forge. The inn provided hospitality to travelers when the colony was just a scattering of farms. In part because of its location, it became a prosperous tavern, inn, and social center for the evolving community of the same name.
An American Success Story: The Pope House of Raleigh, NC
tells the story of Manassa Pope, the first black man to receive a medical license in North Carolina (1886). After practicing medicine and helping establish a drug store and insurance company in Charlotte, Pope moved his family to Raleigh. There he continued his medical practice, built an elegant house (equipped with the latest technologies) located in the best place allowed for a black family in a segregated city. He later ran for mayor.
Our Shared History: African American Heritage
tells about the Underground Railroad, African Americans in the Civil War, historic places of the civil rights movement, the Delta blues of the Lower Mississippi Valley, and landmarks dedicated to Booker T. Washington, Martin Luther King, and Frederick Douglass.
The Battle of Bentonville: Caring for Casualties of the Civil War
shows how battlefield medical care developed during the Civil War, particularly in the Union Army.
National Register Travel Itineraries
can help families explore historic places in the U.S. Each itinerary describes historic places and their importance, and provides maps, photos, and tourist information. Find itineraries for learning about Civil War battles in Virginia, the Lewis and Clark Expedition, maritime history, women's history, civil rights movement, Florida shipwrecks, the Southwest, Amana Colonies, Ohio and Erie Canal, Detroit, the California coast, Washington, D.C., and more.
National Mall and Memorial Parks
provides information about the Washington Monument, the Lincoln Memorial, the Jefferson Memorial, Ford's Theatre, the Franklin Roosevelt Memorial, the Korean War Veterans Memorial, the Vietnam Veterans Memorial, and more.
Maritime History of Massachusetts
This is is a travel itinerary highlighting 89 historic places that tell the story of Massachusetts' relationship with the sea. Read essays about lighthouses and lifesaving stations, ships and shipbuilding, the U.S. Navy, and maritime commerce.
Gran Quivira: A Blending of Cultures in a Pueblo Indian Village
can help students understand daily life and how it changed for the Pueblo Indians of Gran Quivira, the largest of the three Salinas pueblos located in central New Mexico.