Green River Fossils
![Green River Fossils](https://geology.com/c2/green-river-fossils-180.jpg)
Spectacular Fossils of the Green River Formation. Some of the world\'s best fossil fish.
Air Bubbles in Amber
![Air Bubbles in Amber](https://geology.com/c2/amber-180.jpg)
Bubbles in Amber Cretaceous oxygen levels determed from air bubbles trapped in amber.
Geology Dictionary
![Geology Dictionary](https://geology.com/a/geology-dictionary.gif)
Geology Dictionary - contains thousands of geological terms with their definitions.
Igneous and Volcanic
![igneous and volcanic features](https://geology.com/a/igneous-volcanic-features.gif)
Igneous and Volcanic Features an introduction to how these rocks occur below and above ground.
Fossils
![fossil](https://geology.com/a/fossil.jpg)
Fossils are remains, traces or imprints of ancient life. They reveal Earth's biological history.
Geologic Time Scale
![Geologic Time Scale](https://geology.com/c2/time-scale-180.gif)
Divisions of Geologic Time USGS periodically revises rock unit names and age estimates.
Land Below Sea Level
![Land Below Sea Level](https://geology.com/a/below-sea-level.jpg)
Land Below Sea Level - Did you know that dozens of land locations are below sea level?
Darvaza Gas Crater
![Darvaza Gas Crater](https://geology.com/a/darvaza-gas-crater.jpg)
The Doorway to Hell is a flaming sinkhole seeping natural gas that has been burning for decades.
Troglobites
![Troglobites](https://geology.com/c2/troglobites-180.jpg)
Troglobites are creatures that have adapted to a permanent life in the darkness of a cave.
What Is Earth Science?
![What Is Earth Science?](https://geology.com/c/180-what-is-earth-science.jpg)
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
Watch out for Ticks!
![Ticks](https://geology.com/a/tick.jpg)
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Rare Earth Elements
![Rare Earth Elements](https://geology.com/c2/rare-earth-elements-180.jpg)
REEs Special metals used in cell phones, DVDs, batteries, magnets & many other products.
What are Glaciers?
![What are Glaciers?](https://geology.com/a/glaciers.jpg)
What are Glaciers? Learn how glaciers form, flow, advance, retreat, and change over time.
What Geologists Do
![What Does a Geologist Do?](https://geology.com/cover/geologist.jpg)
What Does a Geologist Do? Information and two videos about the relevance of geology today.
What is a Geyser?
![What is a Geyser?](https://geology.com/a/geysers.jpg)
What is a Geyser? Photos of geysers from around the world. Causes, height and more.
Homeowner Insurance
![Homeowner\'s Insurance and Geologic Hazards](https://geology.com/c/180-home-insurance.jpg)
Homeowners Insurance and Geologic Hazards Most policies do not cover geologic hazards.
Tallest Waterfall
![Tallest Waterfall](https://geology.com/records/images/highest-waterfall.jpg)
Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
Great Rift Valley
![Great Rift Valley](https://geology.com/c/180-east-africa-rift.jpg)
The East Africa Rift System Learn about the complex East Africa Rift Valley system.
Bottled Water
![Bottled Water](https://geology.com/cover/bottled-water.jpg)
The Geology of Bottled Water It costs 1000x as much as tap water. What are you getting?
Waterproof Paper
![Waterproof Paper](https://geology.com/a/waterproof-paper.jpg)
Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Gold Panning Kits
![Gold Pans](https://geology.com/a/gold-panning-kits.jpg)
Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for gold!
Cell Phone Photos
![macro lens photos](https://geology.com/articles/cell-phone-cameras/cell-phone-lens.jpg)
Take Great Cell Phone Photos - Low-cost, easy-to-use lenses will improve your photos.
Yosemite Glaciers
![Yosemite Glaciers](https://geology.com/c2/yosemite-glaciers-180.jpg)
Yosemite Glaciers There are two active glaciers in Yosemite - both slowly melting away.
What is a Hydrograph?
![What is a Hydrograph?](https://geology.com/cover/hydrograph.gif)
What is a Hydrograph? Charts that display the change of a hydrologic variable over time.
Selenga River
![Selenga River](https://geology.com/c2/selenga-river-180.jpg)
The Selenga River delivers most of the water to Lake Baikal, the largest lake in the world.
Methane Hydrate
![Methane Hydrate](https://geology.com/c2/methane-hydrate-180.jpg)
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
Yosemite Rock Fall
![Yosemite Rock Fall Photos](https://geology.com/c/180-yosemite-rockfall.jpg)
Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn.