Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Sunstone is a gem feldspar with aventurescence caused by light reflecting from platy inclusions.
Help a Science Teacher - At DonorsChoose.org you can support a K-12 science project.
Geology.com News is updated several times each week. Read it here or receive email updates.
Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
||Lightning Strikes Map
Lightning Strikes Map - A NASA map showing the worldwide distribution of lightning activity.
Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Meteorite Identification Step one in identifying a possible meteorite is the magnet test.
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Rhodonite - a manganese silicate used as a minor ore of manganese and as a gemstone.
|Sea Level Rise Maps
Sea Level Rise Maps - See what will be flooded as sea level rises.
Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Diamonds - Learn about the properties of diamond, its many uses and diamond discoveries.
Crushed Stone - About four tons per person is used each year in the United States.
||Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
||Find Minerals & Gems
Find Minerals and Gems - Dozens of sites where you can dig and keep what you find.
Gemstones - Colorful images and articles about diamonds and colored stones.
||Oil and Gas
Oil and Gas - Articles about oil and natural gas in the US and around the world.
Dowsing is a method used to find underground water that is rejected by most geologists.
||The Brewery Rock ?
The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
Limonite - an amorphous iron oxide. Used as an ore of iron and as a pigment since prehistory.
Homeowners Insurance usually does not cover the most common geologic hazards.
Plate Tectonics - Articles, maps, information about plate tectonics and the interior of Earth.
|Asteroid Impact Map
Asteroid Impact Map - Explore fifty of the most obvious asteroid impact craters on Earth.
Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?
Exploring a Hydrocarbon Sea on Titan with a submarine is a potential NASA mission.
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Chatoyant Gems look like the eye of a cat. A line of light moves across the surface of the stone.
||Land Below Sea Level
Land Below Sea Level - Did you know that dozens of land locations are below sea level?
||Huge Diamond Deposit
The Largest Diamond Deposit in the world could be under Popigai Crater in Russia.
|Gems from Space
Extraterrestrial Gems - A number of materials from space are used as attractive gems.
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
||Google Earth - Free
Free Google Earth software allows you to browse seamless world satellite images. Free.
Geologist Tools - Visit our store for a large selection of field and laboratory tools.
Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
||Crater of Diamonds
Crater of Diamonds - The only diamond mine in the world where you can be the miner.
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
Fossils - Learn about fossils and discoveries around the world.
Emerald is the most popular green gemstone in the United States and most of the world.
Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-colors
||Facts About Copper
Facts About Copper - Information about copper uses, production, resources and more.
||Ruby and Sapphire
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Turquoise - A bluish-green gem material that has been used for over 6000 years.
||San Andreas Fault
The San Andreas Fault - A feature that separates the Pacific and North American Plates.
Granite - The intrusive igneous rock that underlies continents and countertops.
Teacher Resources - K-12 resources for teaching about earth science.
Shale - The rock that has quickly transformed the oil and gas industry.
How Do Snowflakes Form? They start as tiny crystals and change as they fall to Earth.
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Petrified Wood is a fossil that forms when dissolved material preciptates and replaces wood.
Rock Glaciers - Masses of rock, ice, snow, mud and water that slowly flow down slope.
Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
||What Is The Moho?
What Is The Moho? Learn about the Mohorovicic Discontinuity - the mantle/crust boundary.
Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
|What is Geology?
What is Geology? - The study of Earth materials, structures, processes and life over time.
Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
||Rare Earth Elements
Rare Earths - Special materials used in electronics, defense, medical & many other products.
||US Diamond Mines
US Diamond Mines - Did you know that diamonds have been found in the United States?
Meteorites - Rocks that were once parts of planets or large asteroids.
Astronomy - Fantastic images and articles about solar system and deep-space astronomy.
||Geologic Time Scale
Divisions of Geologic Time - USGS time scale with unit names and age estimates.
||Cave of the Hands
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Diamond Misconception - Lots of people think that diamonds form from coal. Not True!
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Basalt - Most of the ocean basin and part of the continents are underlain by basalt.
|Great Rift Valley
The East Africa Rift System - The extensive fault system that is tearing Africa apart.
The Host Rock of Diamonds - Diamonds are found in Kimberlite, a variety of peridotite.
||USA Landslide Map
Landslide Incidence Map - A USGS map showing landslide incidence in the United States.
||The Acid Test
The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Frac Sand - The amount of frac sand produced in the USA is up by over 300% since 2009.
||What Is Earth Science?
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Sand is a diverse material. This gallery includes photos of sand from around the world.
|Uses of Gold
The Many Uses of Gold - Unique properties make gold one of the most useful metals.
Horizontal Drilling has opened new resources and significantly improved productivity.
||Coal Close Up
Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.
||Types Of Eruptions
Types of Volcanic Eruptions - A description of the most common eruption types.
Metals are important mineral products used in manufacturing and construction projects.
||Uses of Marble
The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
Hydraulic Fracturing - Increases well yield by fracturing the reservoir rock with fluid injection.
Largest Desert - The Sahara is huge but two polar deserts are larger.
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.
||Volcanoes in Space
Extraterrestrial Volcanoes - Earth is not the only solar system body with volcanoes.
|What is a Geyser?
Photos of Geysers from around the world with information about height, eruption interval, more.
Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Rock Art - People have been marking on rocks for thousands of years.
Salt Domes - Columns of salt that move upwards because of their low specific gravity.
|Cell Phone Photos
Take Great Cell Phone Photos - Low-cost, easy-to-use lenses will improve your photos.
Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
||What is LNG?
What is LNG? The use of LNG as an energy source is growing rapidly. Learn more about LNG.
||Rocks on Mars
Rocks on Mars - Many of the rocks found on Mars are not very different from Earth rocks.