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