• ABC's of Plate tectonics
• This Dynamic Earth: The Story of Plate Tectonics
• Plate Motion Calculator
• Plate Margins Initiative
• History of plate motions (includes a "movie")
• Digital age grid of ocean floor
• Birth of the Atlantic Ocean
• Shallow structure of a subduction zone
• A slice through a midocean ridge
• The Ocean Drilling Program
• How plate tectonics gives rise to earthquakes
• Earthquakes and Plate Tectonics
• Satellite Laser ranging and North America motion
• GPS shows Nazca-South America motion building the Andes
• Using the Global Positioning System for geology
• "Movies" of midocean ridge spreading
• Interactive calculation of plate velocities
• the Global Positioning System Satellites
• Very Long Baseline radio Interferometry

• Topex page
• TOPEX/Poseiden Estimated Seafloor Topography
• ETOPO-5 data
• Join a cruise to a midocean ridge
• Iceland: The Mid-Atlantic Ridge above water
• The Mid-Atlantic Ridge underwater

• Redoing Erathosthenes' experiment today
• Another way of showing a magnetic field
• The Earth's magnetic field through time
• More about the Earth's magnetic field
• How do we know how old the Earth is?
• The geological time scale
• Another web-page on radiometric dating

Miscellaneous

• Moments of inertia for various shapes
• The diamond anvil cell
• More about convection
• A convection "movie"
• A fancier convection "movie" (try the high-Rayleigh number)
• Exploring Antarctica
• Tibet
• The Arbuckle Mountains of Oklahoma
• An experiment with Ice Cream and Liquid Nitrogen!
• Minerals
• Identifying minerals with X-ray diffraction
• More about X-ray diffraction
• How various rocks form
• Minerals and gemstones
• sci.geo.petroleum Internet Resources
• 1000 geology links