|What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Expansive Soil Causes more damage than floods, hurricanes & tornadoes combined.
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Salt Domes - Salt structures that are often associated with oil and natural gas.
Olivine Rain? Spitzer Telescope discovered a rain of olivine crystals on protostar HOPS-68.
Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
||UV Mineral Lamp
Portable UV Lamp Short and long wave for fluorescent mineral studies. Safety glasses included.
||What Is The Moho?
What Is The Moho? Learn about the Mohorovicic Discontinuity - the mantle/crust boundary.
Chatoyant Gems look like the eye of a cat. A line of light moves across the surface of the stone.
Crushed Stone - About four tons per person is used each year in the United States.
Horizontal Drilling has opened new resources and significantly improved productivity.
|What is a Geyser?
Photos of Geysers from around the world with information about height, eruption interval, more.
||Types Of Eruptions
Types of Volcanic Eruptions - A description of the most common eruption types.
Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Frac Sand - The amount of frac sand produced in the USA is up by over 300% since 2009.
|Uses of Marble
The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
||What is LNG?
What is LNG? The use of LNG as an energy source is growing rapidly. Learn more about LNG.
Rock Art - People have been marking on rocks for thousands of years.
Diamond Misconception - Lots of people think that diamonds form from coal. Not True!
||What is Geology?
What is Geology? - The study of Earth materials, structures, processes and life over time.
Rock Glaciers - Masses of rock, ice, snow, mud and water that slowly flow down slope.
Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Emerald is the most popular green gemstone in the United States and most of the world.
Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.
||San Andreas Fault Map
Google Map of the San Andreas Fault Zoom in to see the fault trace on satellite images.
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
||The Brewery Rock ?
The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.
||Crater of Diamonds
Crater of Diamonds - The only diamond mine in the world where you can be the miner.
|What Is Earth Science?
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
Dallol Volcano is one of the strangest landscapes on earth - at 269 feet below sea level.
||Uses of Gold
The Many Uses of Gold - Unique properties make gold one of the most useful metals.
|Google Earth - Free
Free Google Earth software allows you to browse seamless world satellite images. Free.
||Sea Level Rise Maps
Sea Level Rise Maps - See what will be flooded as sea level rises.
Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?
|Rare Earth Elements
Rare Earths - Special materials used in electronics, defense, medical & many other products.
Teacher Resources - K-12 resources for teaching about earth science.
Gemstones - Colorful images and articles about diamonds and colored stones.
|What are Glaciers?
What are Glaciers? Learn how glaciers form, flow, advance, retreat, and change over time.
Homeowners Insurance usually does not cover the most common geologic hazards.
Diamonds - Learn about the properties of diamond, its many uses and diamond discoveries.
|The Acid Test
The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Meteorites - Rocks that were once parts of planets or large asteroids.
||United States Wall Maps
Wall Maps - Shaded relief wall maps of U.S. States. Great for your office or classroom.
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
||Oil and Gas
Oil and Gas - Articles about oil and natural gas in the US and around the world.
Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
|Asteroid Impact Map
Asteroid Impact Map - Explore fifty of the most obvious asteroid impact craters on Earth.
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
||Great Rift Valley
The East Africa Rift System - The extensive fault system that is tearing Africa apart.
|US Diamond Mines
US Diamond Mines - Did you know that diamonds have been mined in the United States?
||Rocks on Mars
Rocks on Mars - Many of the rocks found on Mars are not very different from Earth rocks.
Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
Astronomy - Fantastic images and articles about solar system and deep-space astronomy.
Petrified Wood is a fossil that forms when dissolved material preciptates and replaces wood.
Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
Azurite Granite ? A white granite with blue orbs of azurite. A new material from Pakistan.
Meteorite Identification Step one in identifying a possible meteorite is the magnet test.
Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-colors
|Land Below Sea Level
Land Below Sea Level - Did you know that dozens of land locations are below sea level?
Fossils - Learn about fossils and discoveries around the world.
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
||San Andreas Fault
The San Andreas Fault - A feature that separates the Pacific and North American Plates.
Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
|Gems from Space
Extraterrestrial Gems - A number of materials from space are used as attractive gems.
Plate Tectonics - Articles, maps, information about plate tectonics and the interior of Earth.
Dowsing is a method used to find underground water that is rejected by most geologists.
|Lightning Strikes Map
Lightning Strikes Map - A NASA map showing the worldwide distribution of lightning activity.
Turquoise - A bluish-green gem material that has been used for over 6000 years.
Hydraulic Fracturing - Increases well yield by fracturing the reservoir rock with fluid injection.
|Ruby and Sapphire
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
||Cave of the Hands
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
|Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
||Coal Close Up
Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
Granite - The intrusive igneous rock that underlies continents and countertops.
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
||Facts About Copper
Facts About Copper - Information about copper uses, production, resources and more.
Sunstone is a gem feldspar with aventurescence caused by light reflecting from platy inclusions.
Sand is a diverse material. This gallery includes photos of sand from around the world.
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Shale - The rock that has quickly transformed the oil and gas industry.
California Earthquake Maps A collection of isoseismal maps for earthquakes in California.
||Oil Fields from Space
Oil Fields from Space - Night views of Earth show the distribution of oil field activity.
Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
|Life on Europa ?
Life on Europa might exist in a salty ocean a short distance below its frozen surface.
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
||USA Landslide Map
Landslide Incidence Map - A USGS map showing landslide incidence in the United States.
|Fee Mining Sites
Fee Mining sites are mines that you can enter, pay a fee, and keep anything that you find.
Largest Desert - The Sahara is huge but two polar deserts are larger.
||Find Minerals & Gems
Find Minerals and Gems - Dozens of sites where you can dig and keep what you find.
Mount Cleveland is an active volcano in the Aleutian Islands and a threat to air traffic.
Exploring a Hydrocarbon Sea on Titan with a submarine is a potential NASA mission.
||Arctic Seafloor Map
Arctic Ocean Seafloor Map The ridges, basins, shelves and rifts defining the Arctic seafloor.
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
||Huge Diamond Deposit
The Largest Diamond Deposit in the world could be under Popigai Crater in Russia.
|Volcanoes in Space
Extraterrestrial Volcanoes - Earth is not the only solar system body with volcanoes.
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Rhodonite - a manganese silicate used as a minor ore of manganese and as a gemstone.
Yosemite Glaciers There are two active glaciers in Yosemite - but they are slowly melting away.
Mineral Rights Who owns the minerals under your land? Who wants to buy them?
The Host Rock of Diamonds - Diamonds are found in Kimberlite, a variety of peridotite.
Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Rock Kits for classroom and personal study. A great way to learn about rocks.
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Wrong Volcano! The most powerful eruption of the 20th century was misidentified?
Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Rhodochrosite a manganese mineral used as an ore, a pink gem and an ornamental stone.
The Richest Meteorite Field - More meteorites found here than anywhere else on Earth.
Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Beryl is the gem mineral of emerald, aquamarine, morganite, red beryl, heliodor and more.