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IoliteIolite Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite. Azurite GraniteK2 Granite Azurite Granite ? A white granite with blue orbs of azurite. A new material from Pakistan. Sliding RocksSliding Rocks Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley? Great Rift ValleyGreat Rift Valley The East Africa Rift System - The extensive fault system that is tearing Africa apart.
Crater of DiamondsCrater of Diamonds Crater of Diamonds - The only diamond mine in the world where you can be the miner. What are Glaciers?What are Glaciers? What are Glaciers? Learn how glaciers form, flow, advance, retreat, and change over time. Geology StoreGeology Tools Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans. Geology.com NewsGeology News Geology.com News is updated several times each week. Read it here or receive email updates.
RocksRocks Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions. US Diamond MinesUS Diamond Mines US Diamond Mines - Did you know that diamonds have been mined in the United States? Yosemite GlaciersYosemite Glaciers Yosemite Glaciers There are two active glaciers in Yosemite - but they are slowly melting away. Tanzanitetanzanite Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Oil Fields from Spacenatural gas flaring Oil Fields from Space - Night views of Earth show the distribution of oil field activity. Fireworks & Mineralsfireworks The Science of Fireworks Their shapes and colors - produced through chemistry, physics & art. San Andreas Fault MapSan Andreas Fault Map Google Map of the San Andreas Fault Zoom in to see the fault trace on satellite images. Coal Close UpCoal through a microscope Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.
Mount ClevelandMount Cleveland Mount Cleveland is an active volcano in the Aleutian Islands and a threat to air traffic. MineralsMinerals Minerals - Descriptions, photos, articles, properties and uses for common minerals. Arctic Seafloor MapArctic Ocean Seafloor Map Arctic Ocean Seafloor Map The ridges, basins, shelves and rifts defining the Arctic seafloor. PeridotiteKimberlite The Host Rock of Diamonds - Diamonds are found in Kimberlite, a variety of peridotite.
Earthquake MapsCalifornia Earthquake Maps California Earthquake Maps A collection of isoseismal maps for earthquakes in California. Sea Level Rise MapsSea Level Rise Maps Sea Level Rise Maps - See what will be flooded as sea level rises. Find Minerals & GemsFee Mining Find Minerals and Gems - Dozens of sites where you can dig and keep what you find. Life on Europa ?Life on Europa Life on Europa might exist in a salty ocean a short distance below its frozen surface.
Volcanic ExplosivityVolcanic Explosivity Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected. SunstoneSunstone Sunstone is a gem feldspar with aventurescence caused by light reflecting from platy inclusions. Lightning Strikes MapLightning Strikes Map Lightning Strikes Map - A NASA map showing the worldwide distribution of lightning activity. MineraloidsMineraloids Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
Oil and GasOil and Gas Oil and Gas - Articles about oil and natural gas in the US and around the world. Mount VesuviusMount Vesuvius Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions. Identifying MeteoritesMeteorite Identification Meteorite Identification Step one in identifying a possible meteorite is the magnet test. Bear AttacksBear Attacks Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
The Brewery Rock ?diatomite The Rock Used to Make Beer - Geologists are beer experts and should know about this rock. DonorsChoose.orgDonorsChoose.org Help a Science Teacher - At DonorsChoose.org you can support a K-12 science project. Google Earth - FreeDownload Google Earth Free Free Google Earth software allows you to browse seamless world satellite images. Free. GemstonesGemstones Gemstones - Colorful images and articles about diamonds and colored stones.
Lapis LazuliLapis Lazuli Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history. DiamondsDiamonds Diamonds - Learn about the properties of diamond, its many uses and diamond discoveries. OpalsOpal Pictures of Opal - A collection of different types of opal from all around the world and Mars too! Dowsingdowsing Dowsing is a method used to find underground water that is rejected by most geologists.
Asteroid Impact MapAsteroid Impact Map Asteroid Impact Map - Explore fifty of the most obvious asteroid impact craters on Earth. Fluorescent MineralsFluorescent Minerals Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light. Land Below Sea LevelLand Below Sea Level Land Below Sea Level - Did you know that dozens of land locations are below sea level? RhodoniteRhodonite Rhodonite - a manganese silicate used as a minor ore of manganese and as a gemstone.
ObsidianObsidian Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass. San Andreas FaultSan Andreas Fault The San Andreas Fault - A feature that separates the Pacific and North American Plates. 100+ Gemstonescolored stones 100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure. Watch out for Ticks!ticks Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
MisconceptionDiamonds from Coal Diamond Misconception - Lots of people think that diamonds form from coal. Not True! Plate TectonicsPlate Tectonics Plate Tectonics - Articles, maps, information about plate tectonics and the interior of Earth. EmeraldEmerald Emerald is the most popular green gemstone in the United States and most of the world. Tallest TsunamiTallest Tsunami Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Crushed StoneCrushed Stone Crushed Stone - About four tons per person is used each year in the United States. FossilsFossils Fossils - Learn about fossils and discoveries around the world. Gems from SpaceGems from Space Extraterrestrial Gems - A number of materials from space are used as attractive gems. The Acid TestThe Acid Test The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Petrified WoodPetrified Wood Petrified Wood is a fossil that forms when dissolved material preciptates and replaces wood. TurquoiseTurquoise Turquoise - A bluish-green gem material that has been used for over 6000 years. Teacher ResourcesTeacher Resources Teacher Resources - K-12 resources for teaching about earth science. What Is The Moho?What Is The Moho? What Is The Moho? Learn about the Mohorovicic Discontinuity - the mantle/crust boundary.
Mineral HardnessMohs Hardness Test Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing. Methane HydrateMethane Hydrate Methane Hydrate deposits contain more fuel value than all other fossil fuels combined. Uses of MarbleUses of Marble The Uses of Marble are numerous and diverse. You will be surprised by how it is used. AmmoliteAmmolite Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
Huge Diamond DepositPopigai Diamonds The Largest Diamond Deposit in the world could be under Popigai Crater in Russia. What Is Earth Science?What Is Earth Science? What Is Earth Science? The study of Earth and its neighbors in space. Learn more! Homeowners InsuranceHomeowners Insurance Homeowners Insurance usually does not cover the most common geologic hazards. Titan SubmarineTitan Submarine Exploring a Hydrocarbon Sea on Titan with a submarine is a potential NASA mission.
LabradoriteLabradorite Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-colors Rock ArtRock Art Rock Art - People have been marking on rocks for thousands of years. CorundumCorundum Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire. Cave of the HandsCave of the Hands Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
AstronomyAstronomy Astronomy - Fantastic images and articles about solar system and deep-space astronomy. What is Geology?What is Geology? What is Geology? - The study of Earth materials, structures, processes and life over time. MetalsMetals Metals are important mineral products used in manufacturing and construction projects. Facts About CopperCopper Facts About Copper - Information about copper uses, production, resources and more.
Rare Earth ElementsRare Earth Elements Rare Earths - Special materials used in electronics, defense, medical & many other products. Largest DesertLargest Desert Largest Desert - The Sahara is huge but two polar deserts are larger. Largest EarthquakeLargest Earthquake Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960. MeteoritesMeteorites Meteorites - Rocks that were once parts of planets or large asteroids.
Ruby and Sapphireruby and sapphire Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States. Horizontal DrillingHorizontal Drilling Horizontal Drilling has opened new resources and significantly improved productivity. SoapstoneSoapstone Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects. What is a Geyser?What is a Geyser? Photos of Geysers from around the world with information about height, eruption interval, more.
GraniteGranite Granite - The intrusive igneous rock that underlies continents and countertops. USA Landslide MapLandslides Landslide Incidence Map - A USGS map showing landslide incidence in the United States. AmetrineAmetrine Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity. VolcanoesVolcanoes Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Chatoyant GemsChatoyant Gems Chatoyant Gems look like the eye of a cat. A line of light moves across the surface of the stone. SandSand Sand is a diverse material. This gallery includes photos of sand from around the world. Volcanoes in SpaceExtraterrestrial Volcanoes Extraterrestrial Volcanoes - Earth is not the only solar system body with volcanoes. Tallest MountainTallest Mountain Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Limonitelimonite Limonite - an amorphous iron oxide. Used as an iron ore and pigment since prehistory. GarnetGarnet Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses. What is LNG?What is LNG? What is LNG? The use of LNG as an energy source is growing rapidly. Learn more about LNG. HematiteHematite on Mars Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
Uses of GoldUses of Gold The Many Uses of Gold - Unique properties make gold one of the most useful metals. Frac SandFrac Sand Frac Sand - The amount of frac sand produced in the USA is up by over 300% since 2009. Types Of EruptionsTypes Of Eruptions Types of Volcanic Eruptions - A description of the most common eruption types. Hydraulic FracturingHydraulic Fracturing Hydraulic Fracturing - Increases well yield by fracturing the reservoir rock with fluid injection.
ShaleShale Shale - The rock that has quickly transformed the oil and gas industry. Rock GlaciersRock Glaciers Rock Glaciers - Masses of rock, ice, snow, mud and water that slowly flow down slope. Largest VolcanoesLargest Volcanoes Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado. BasaltBasalt Basalt - Most of the ocean basin and part of the continents are underlain by basalt.
Rocks on MarsRocks on Mars Rocks on Mars - Many of the rocks found on Mars are not very different from Earth rocks. Salt DomesSalt Domes Salt Domes - Columns of salt that move upwards because of their low specific gravity. Mount EtnaMount Etna Mount Etna - The most active volcano in Europe continues an eruption that started in 2001. Yosemite Rock FallYosemite Rock Fall Photos Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn.
       

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