General Geology Articles and Information

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

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

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

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.

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

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.

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

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.

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.