General Geology Articles and Information

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

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

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

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.

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

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.

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

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.

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

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

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

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

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

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

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

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.

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

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

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.

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

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

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

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.

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.

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

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.

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?

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

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.

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

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

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