General Geology Articles and Information

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.

Minerals are the building blocks of our society. We use items made with them every day.

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

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.

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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.

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

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

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