What Does a Geologist Do? Information and two videos about the relevance of geology today.
Rocks Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
||What Are Minerals?
Minerals are the building blocks of our society. We use items made with them every day.
||Geologic Time Scale
Divisions of Geologic Time USGS periodically revises rock unit names and age estimates.
Troglobites are creatures that have adapted to a permanent life in the darkness of a cave.
||What Is Earth Science?
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
Plate Tectonics Articles, theory, plate diagrams, plate maps and teaching ideas.
||Great Rift Valley
The East Africa Rift System Learn about the complex East Africa Rift Valley system.
|Maps Of Pangaea
Pangaea Maps A sequence of maps shows how a large supercontinent fragmented.
Sliding Rocks - Racetrack Playa How these rocks slide across a dry lake bed is a mystery.
||Gold History and Uses
Gold A history of gold uses, mining and prospecting over thousands of years.
||Diamonds from Coal?
Diamonds from Coal? They form under several conditions that rarely involve coal.
|What is a Geyser?
What is a Geyser? Photos of geysers from around the world. Causes, height and more.
Volcanos Articles about volcanoes, volcanic hazards and eruptions past and present.
Salt Glaciers are masses of salt that flow downslope under their own weight.
Geology Tools Available are pick, chisel and crack hammers, rock chisels, goggles and more.
How Old is the Grand Canyon? Wayne Ranney explores the age of the Grand Canyon.
The Geology of Bottled Water It costs 1000x as much as tap water. What are you getting?
Salt Domes are columns of salt that move upwards because of the salt\'s low specific gravity.
Bear Attacks Knowing how to react to a bear encounter and attack could save your life.
|What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
How Do Snowflakes Form? They grow from a tiny particle but they might not reach the Earth.
||San Andreas Fault
What is the San Andreas Fault? Map, photos and description of the fault by Dr. David Lynch.
Landslides A USGS fact sheet about landslides and events that trigger them.
|Green River Fossils
Spectacular Fossils of the Green River Formation. Some of the world\'s best fossil fish.
Roadside Geology Guides Learn about the Geology of your favorite state as seen from the road.
||Rare Earth Elements
REEs Special metals used in cell phones, DVDs, batteries, magnets & many other products.
||Air Bubbles in Amber
Bubbles in Amber Cretaceous oxygen levels determed from air bubbles trapped in amber.
|What is a Hydrograph?
What is a Hydrograph? Charts that display the change of a hydrologic variable over time.
Yosemite Glaciers There are two active glaciers in Yosemite - but they are slowly melting away.
The Selenga River delivers most of the water to Lake Baikal, the largest lake in the world.
Homeowner\'s Insurance and Geologic Hazards Most policies do not cover geologic hazards.
Stream Gaging Stations Used by hydrologists to monitor streams or other water bodies.
Dowsing is a method used to find underground water that is rejected by most geologists.