General Geology Articles and Information

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

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

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

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..

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.

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

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?

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.

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

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

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

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

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

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.

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

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.

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

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

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.

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.

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

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

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

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

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

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

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

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

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

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

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.

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

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

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.

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