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!
||Land Below Sea Level
Land Below Sea Level - Did you know that dozens of land locations are below sea level?
||The Brewery Rock ?
The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
||Uses of Gold
The Many Uses of Gold - Unique properties make gold one of the most useful metals.
Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Geology.com News is updated several times each week. Read it here or receive email updates.
||Lunar Rift System
Lunar Rift System? Gravity maps revise the geologic history of the near side of the moon.
Rock Art - People have been marking on rocks for thousands of years.
|Asteroid Impact Map
Asteroid Impact Map - Explore fifty of the most obvious asteroid impact craters on Earth.
Gemstones - Colorful images and articles about diamonds and colored stones.
Most Powerful Eruption of the 20th Century - One hour later, the blast was heard in Juneau.
||What is LNG?
What is LNG? The use of LNG as an energy source is growing rapidly. Learn more about LNG.
Diamond Misconception - Lots of people think that diamonds form from coal. Not True!
||What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Plate Tectonics - Articles, maps, information about plate tectonics and the interior of Earth.
||Cave of the Hands
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Homeowners Insurance usually does not cover the most common geologic hazards.
||Oil and Gas
Oil and Gas - Articles about oil and natural gas in the US and around the world.
||Facts About Copper
Facts About Copper - Information about copper uses, production, resources and more.
||Find Minerals & Gems
Find Minerals and Gems - Dozens of sites where you can dig and keep what you find.
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Teacher Resources - K-12 resources for teaching about earth science.
Diamonds - Learn about the properties of diamond, its many uses and diamond discoveries.
Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?
Salt Glaciers are masses of salt that flow downslope under their own weight.
||Google Earth - Free
Free Google Earth software allows you to browse seamless world satellite images. Free.
Fluorescent Minerals glow with spectacular colors under ultraviolet light.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
Pumice is a rock formed during explosive volcanic eruptions. It has a wide variety of uses.
||Sea Level Rise Map
Sea Level Rise Map - A Google map that shows where flooding will occur as sea level rises.
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
||Rare Earth Elements
Rare Earths - Special materials used in electronics, defense, medical & many other products.
Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
Organic Gems are gems formed from or by plants or animals. They might also be fossils.
Meteorites - Rocks that were once parts of planets or large asteroids.
Geologist Tools - Visit our store for a large selection of field and laboratory tools.
California Earthquake Maps - A collection of isoseismal maps for earthquakes in California.
||San Andreas Fault
The San Andreas Fault - A feature that separates the Pacific and North American Plates.
||Gems from Space
Extraterrestrial Gems - A number of materials from space are used as attractive gems.
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
|US Diamond Mines
US Diamond Mines - Did you know that diamonds have been found in the United States?
Fossils - Learn about fossils and fossil discoveries around the world.
Astronomy - Fantastic images and articles about solar system and deep-space astronomy.
Sunstone is a gem feldspar with aventurescence caused by light reflecting from platy inclusions.
Emerald is the most popular green gemstone in the United States and most of the world.
Turquoise - A blue to bluish-green gem material that has been used for over 6000 years.
||Uses of Marble
The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
Petrified Wood is a fossil that forms when dissolved material preciptates and replaces wood.
Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-colors
Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
||What is a Geyser?
Photos of Geysers from around the world with information about height, eruption interval, more.
Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
|The Acid Test
The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
||New Eruptions on Io
Eruptions launch lava hundreds of miles above the surface of Io, a moon of Jupiter.
||Rocks on Mars
Rocks on Mars - Many of the rocks found on Mars are not very different from Earth rocks.
Frac Sand - The amount of frac sand produced in the USA is up by over 300% since 2009.
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Sand is a diverse material. This gallery includes photos of sand from around the world.
Metals are important mineral products used in manufacturing and construction projects.
||USA Landslide Map
Landslide Incidence Map - A USGS map showing landslide incidence in the United States.
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Oil Sands contain oil in the form of bitumen. A major oil resource that can be difficult to produce.
||Types Of Eruptions
Types of Volcanic Eruptions - A description of the most common eruption types.
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.
||Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Abandoned Mine Accidents kill 20 to 30 per year. Many can be prevented with education.
Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
||Coal Close Up
Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.
Largest Desert - The Sahara is huge but two polar deserts are larger.
Hydraulic Fracturing - Increases well yield by fracturing the reservoir rock with fluid injection.
Pavlof Volcano is one of the most active volcanoes in North America and a threat to air traffic.
||Eagle Ford Shale
Eagle Ford Shale - One of the most prolific producers of oil and gas in the United States.
Horizontal Drilling has opened new resources and significantly improved productivity.
Olivine is a rock-forming mineral found in the crust, the mantle, and in some meteorites.
Scoria is a dark-colored, extrusive igneous rock with abundant vesicles.
Strange Volcanic Landscape! Photos of Dallol Volcano - an explosion crater in Ethiopia.
Salt Domes are columns of salt that move upwards because of the salt\'s low specific gravity.
||Geologic Time Scale
Divisions of Geologic Time - USGS time scale with unit names and age estimates.