General Geology Articles and Information

Fossils are remains, traces or imprints of ancient life. They reveal Earth's biological history.

Igneous and Volcanic Features an introduction to how these rocks occur below and above ground.

Geology Dictionary - contains thousands of geological terms with their definitions.

Troglobites are creatures that have adapted to a permanent life in the darkness of a cave.

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

Minerals - Descriptions, photos, articles, properties and uses for common minerals..

Roadside Geology Guides Explain the Geology of your state as seen from the road.

Land Below Sea Level - Did you know that dozens of land locations are below sea level?

Divisions of Geologic Time USGS periodically revises rock unit names and age estimates.

Gifts That Rock - What are the most popular gift items in the Geology.com store?

Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.

Sliding Rocks - How these rocks slide across a dry lake bed is a mystery.

What is a Maar? The second most common volcanic landscape feature on Earth.

Pangaea Maps A sequence of maps shows how a large supercontinent fragmented.

Rocks Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.

What Is Earth Science? The study of Earth and its neighbors in space. Learn more!

Geology Tools - Hammers, field bags, hand lenses, maps, hardness picks, gold pans.

Plate Tectonics Articles, theory, plate diagrams, plate maps and teaching ideas.

Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.

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

Gold A history of gold uses, mining and prospecting over thousands of years.

REEs Special metals used in cell phones, DVDs, batteries, magnets & many other products.

Volcanoes Articles about volcanoes, volcanic hazards and eruptions past and present.

Dowsing is a method used to find underground water that is rejected by most geologists.

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

How Old is the Grand Canyon? Wayne Ranney explores the Canyon*s age.

The East Africa Rift System Learn about the complex East Africa Rift Valley system.

What are Glaciers? Learn how glaciers form, flow, advance, retreat, and change over time.

Bear Attacks Knowing how to react to a bear encounter and attack could save your life.

Homeowners Insurance and Geologic Hazards Most policies do not cover geologic hazards.

What is the San Andreas Fault? Map, photos and description of the fault.

Salt Glaciers are masses of salt that flow downslope under their own weight.

Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for gold!

Diamonds from Coal? They form under several conditions that rarely involve coal.

Salt Domes - Salt structures that are often associated with oil and natural gas.

Landslides A USGS fact sheet about landslides and events that trigger them.

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

Rock Glaciers - Masses of ice, snow, rock, mud and water that slowly flow down slope.

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

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

Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.

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

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

The Geology of Bottled Water It costs 1000x as much as tap water. What are you getting?

Stream Gaging Stations Used by hydrologists to monitor streams or other water bodies.

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

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

Yosemite Glaciers There are two active glaciers in Yosemite - both slowly melting away.