What is a Geyser?

What is a Geyser? Photos of geysers from around the world. Causes, height and more.
Darvaza Gas Crater

The Doorway to Hell is a flaming sinkhole seeping natural gas that has been burning for decades.
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.
Green River Fossils

Spectacular Fossils of the Green River Formation. Some of the world\'s best fossil fish.
Air Bubbles in Amber

Bubbles in Amber Cretaceous oxygen levels determed from air bubbles trapped in amber.
Fossils

Fossils are remains, traces or imprints of ancient life. They reveal Earth's biological history.
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?
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!
What Geologists Do

What Does a Geologist Do? Information and two videos about the relevance of geology today.
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.
Tallest Waterfall

Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
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?
Cell Phone Photos

Take Great Cell Phone Photos - Low-cost, easy-to-use lenses will improve your photos.
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.
Waterproof Paper

Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Selenga River

The Selenga River delivers most of the water to Lake Baikal, the largest lake in the world.
Yosemite Glaciers

Yosemite Glaciers There are two active glaciers in Yosemite - both slowly melting away.
What is a Hydrograph?

What is a Hydrograph? Charts that display the change of a hydrologic variable over time.
Yosemite Rock Fall

Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn.