|What Is Earth Science?
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
||What Geologists Do
What Does a Geologist Do? Information and two videos about the relevance of geology today.
||Geologic Time Scale
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 Are Minerals?
Minerals are the building blocks of our society. We use items made with them every day.
Rocks Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
||What are Glaciers?
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.
Salt Domes - Salt structures that are often associated with oil and natural gas.
||What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
||Rare Earth Elements
REEs Special metals used in cell phones, DVDs, batteries, magnets & many other products.
||Maps Of Pangaea
Pangaea Maps A sequence of maps shows how a large supercontinent fragmented.
|Gold History and Uses
Gold A history of gold uses, mining and prospecting over thousands of years.
Volcanos Articles about volcanoes, volcanic hazards and eruptions past and present.
Landslides A USGS fact sheet about landslides and events that trigger them.
Sliding Rocks - Racetrack Playa How these rocks slide across a dry lake bed is a mystery.
|San Andreas Fault
What is the San Andreas Fault? Map, photos and description of the fault by Dr. David Lynch.
Bear Attacks Knowing how to react to a bear encounter and attack could save your life.
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
How Old is the Grand Canyon? Wayne Ranney explores the age of the Grand Canyon.
|Great Rift Valley
The East Africa Rift System Learn about the complex East Africa Rift Valley system.
Roadside Geology Guides Learn about the Geology of your favorite state as seen from the road.
||Green River Fossils
Spectacular Fossils of the Green River Formation. Some of the world\'s best fossil fish.
Salt Glaciers are masses of salt that flow downslope under their own weight.
|Yosemite Rock Fall
Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn.
||What is a Geyser?
What is a Geyser? Photos of geysers from around the world. Causes, height and more.
Geology Tools Available are pick, chisel and crack hammers, rock chisels, goggles and more.
Yosemite Glaciers There are two active glaciers in Yosemite - but they are slowly melting away.
|Air Bubbles in Amber
Bubbles in Amber Cretaceous oxygen levels determed from air bubbles trapped in amber.
Rock Glaciers - Masses of ice, snow, rock, mud and water that slowly flow down slope.
||Diamonds from Coal?
Diamonds from Coal? They form under several conditions that rarely involve coal.
The Geology of Bottled Water It costs 1000x as much as tap water. What are you getting?
|Cell Phone Photos
Take Great Cell Phone Photos - Low-cost, easy-to-use lenses will improve your photos.
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.
Troglobites are creatures that have adapted to a permanent life in the darkness of a cave.
|What is a Hydrograph?
What is a Hydrograph? Charts that display the change of a hydrologic variable over time.
Homeowner\'s Insurance and Geologic Hazards Most policies do not cover geologic hazards.