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General Geology Articles and Information
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.
Diamonds - All about their geology, gemology, natural and lab-grown origins.
Geology Dictionary - contains thousands of geological terms with their definitions.
Minerals - Descriptions, photos, articles, properties and uses for common minerals..
Geologic Time Scale
Divisions of Geologic Time USGS periodically revises rock unit names and age estimates.
Gifts That Rock
Gifts That Rock - What are the most popular gift items in the Geology.com store?
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 are creatures that have adapted to a permanent life in the darkness of a cave.
Roadside Geology Guides Explain the Geology of your state as seen from the road.
Maps Of Pangaea
Pangaea Maps A sequence of maps shows how a large supercontinent fragmented.
Plate Tectonics Articles, theory, plate diagrams, plate maps and teaching ideas.
Rocks Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Sliding Rocks - How these rocks slide across a dry lake bed is a mystery.
What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Geology Tools - Hammers, field bags, hand lenses, maps, hardness picks, gold pans.
What Is Earth Science?
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
Gold History and Uses
Gold A history of gold uses, mining and prospecting over thousands of years.
Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Volcanoes Articles about volcanoes, volcanic hazards and eruptions past and present.
What are Glaciers?
What are Glaciers? Learn how glaciers form, flow, advance, retreat, and change over time.
What Geologists Do
What Does a Geologist Do? Information and two videos about the relevance of geology today.
Rare Earth Elements
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.
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.
Homeowners Insurance and Geologic Hazards Most policies do not cover geologic hazards.
Rock Glaciers - Masses of ice, snow, rock, mud and water that slowly flow down slope.
Great Rift Valley
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.
The Geology of Bottled Water It costs 1000x as much as tap water. What are you getting?
San Andreas Fault
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.
Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Diamonds from Coal?
Diamonds from Coal? They form under several conditions that rarely involve coal.
Salt Glaciers are masses of salt that flow downslope under their own weight.
Gold Panning Kits
Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for gold!
How Old is the Grand Canyon? Wayne Ranney explores the Canyon*s age.
Cell Phone Photos
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.
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
What is a Hydrograph?
What is a Hydrograph? Charts that display the change of a hydrologic variable over time.
Air Bubbles in Amber
Bubbles in Amber Cretaceous oxygen levels determed from air bubbles trapped in amber.
Green River Fossils
Spectacular Fossils of the Green River Formation. Some of the world\'s best fossil fish.
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.
Yosemite Rock Fall
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.