General Geology Articles and Information

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

Diamonds - All about their geology, gemology, natural and lab-grown origins.

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

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

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

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

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.

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

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

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

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

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

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

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

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.

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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