Fossils
Fossils are remains, traces or imprints of ancient life. They reveal Earth's biological history.
Igneous and Volcanic
Igneous and Volcanic Features an introduction to how these rocks occur below and above ground.
Geology Dictionary
Geology Dictionary - contains thousands of geological terms with their definitions.
Geologic Time Scale
Divisions of Geologic Time USGS periodically revises rock unit names and age estimates.
Land Below Sea Level
Land Below Sea Level - Did you know that dozens of land locations are below sea level?
Darvaza Gas Crater
The Doorway to Hell is a flaming sinkhole seeping natural gas that has been burning for decades.
Troglobites
Troglobites are creatures that have adapted to a permanent life in the darkness of a cave.
What Is Earth Science?
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
What are Glaciers?
What are Glaciers? Learn how glaciers form, flow, advance, retreat, and change over time.
Rare Earth Elements
REEs Special metals used in cell phones, DVDs, batteries, magnets & many other products.
What Geologists Do
What Does a Geologist Do? Information and two videos about the relevance of geology today.
Tallest Waterfall
Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
What is a Geyser?
What is a Geyser? Photos of geysers from around the world. Causes, height and more.
Homeowner Insurance
Homeowners Insurance and Geologic Hazards Most policies do not cover geologic hazards.
Great Rift Valley
The East Africa Rift System Learn about the complex East Africa Rift Valley system.
Bottled Water
The Geology of Bottled Water It costs 1000x as much as tap water. What are you getting?
Waterproof Paper
Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Gold Panning Kits
Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for gold!
Methane Hydrate
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
Cell Phone Photos
Take Great Cell Phone Photos - Low-cost, easy-to-use lenses will improve your photos.
What is a Hydrograph?
What is a Hydrograph? Charts that display the change of a hydrologic variable over time.
Selenga River
The Selenga River delivers most of the water to Lake Baikal, the largest lake in the world.
Air Bubbles in Amber
Bubbles in Amber Cretaceous oxygen levels determed from air bubbles trapped in amber.
Yosemite Glaciers
Yosemite Glaciers There are two active glaciers in Yosemite - both slowly melting away.
Green River Fossils
Spectacular Fossils of the Green River Formation. Some of the world\'s best fossil fish.
Yosemite Rock Fall
Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn.