Geologic Time & Tectonics

Earth's History

CK-12 Geologic Time

UCMP Life Has A History

UCMP Web Time Machine

UCMP Fossil Record

AMNH Paleontology

Relative Dating

Rock Layer Video

Interactive Rock Layers
Layer by Layer (Stratigraphy)

Also check out

PHET Earth Science

NatGeo Map Maker

Geologic Time Challenges

Geochronological Units

Geologic Periods Game

Geologic Time Scale Game

Layers of Time

Radioactive Dating Game

Relative Dating Lab #1

Relative Dating Lab #2

Fossil ID Lab Links

Fossils by Shape

Museum of the Earth Fossils

Fossil Guy Resources

Also try a Google Search using a description of your fossil

Plate Tectonics

USGS Dynamic Earth

Khan: Plate Tectonics

Ancient Earth Map

Dive & Discover 

AMNH Plate Challenge

Pangea Puzzle

Earthquakes & Volcanoes

Savage Earth

USGS Earthquake Center

Earthquakes 101 Video 

USGS/Smithsonian Volcanoes

Volcano World

USGS Volcano Center

USGS Volcano Glossary

Deadly Shadow of Vesuvius

Virtual Cave - Lava Tubes

National Geographic Volcanoes