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Who Owns The Arctic?
Who Owns The Arctic? Abundant oil, gas and mineral resources are at stake.
Rock Photo Galleries Rock Photos: Galleries of  igneous, sedimentary and metamorphic rock photos. They work well with computer projection.
What is geology?What Does a Geologist Do?
Learn about the interesting work of geologists in two short videos about the relevance of geology today.
Earth ScienceWhat is Earth Science?It is the study of Earth and its neighbors in space. It includes geology, astronomy, meteorology & oceanography.
Roadside GeologyRoadside Geology Guides: A great way to learn about the geology of your home area and the perfect road trip companion.
novarupta the most powerful volcano of the 20th century The Most Powerful Volcanic Eruption of the 20th Century: Many people have never heard of this Alaskan volcano.
sliding rocks of racetrack playaSliding Rocks of Racetrack Playa: How these rocks slide across a dry lake bed is a mystery. Learn what is thought to move them. © iStock / S. Hoerold
blood diamondsWhat are Blood Diamonds?
Have you seen the movie? Learn what "blood diamond" means.
fluorescent mineralsFluorescent Minerals glow with spectacular colors when illuminated in the dark with an ultraviolet lamp.
meteorites Rocks from Space: Intro to meteorites by Geoff Notkin, Science Channel Meteorite Man and professional meteorite hunter.
Google map of asteroid impacts.Asteroid Impact Craters! Zoom in on 50 of Earth's largest impact craters with Google Maps.
DiamondDiamond: Articles, news, videos, production data, and information related to gem and industrial diamond worldwide.
google map of highest points in each stateHighest Points in All 50 States: Google map of state high points.
marcellus shale gas Marcellus Shale: One of the most overlooked natural gas resources in the United States!
herkimer diamonds Herkimer Diamonds: Amazing doubly-terminated quartz crystals that you can find and keep at a mine near Herkimer, NY.
Mineral RightsMineral Rights / Oil & Gas: Who owns the minerals under your land? Have they been sold? Can someone mine without permission?
rock tumblers and tumbling instructions Rock Tumblers: Step-by-step guide to tumbling agate, jasper, petrified wood and other rocks into beautiful gemstones.
what are minerals?What Are Minerals? They are part of nearly everything that we use: vehicles, medicine, coins, pencils, cell phones, food and more.
uses of goldThe Many Uses of Gold: Learn how the unique properties of gold make it extremely suited for a large number of industrial uses.
Diamond formation Diamond Misconceptions: Diamonds form under a variety of conditions that do not involve coal as a source of carbon.
East Africa Rift East Africa Rift: One of the best places in the world to learn about plate tectonics. By James Wood and Alex Guth Michigan Tech.
LandslideLandslides: A USGS fact sheet explains different types of landslides and the kind of events that might trigger them.
Mohs hardness scaleMohs Hardness Scale is a set of reference minerals used to estimate the relative hardness of mineral specimens.
petrified woodPetrified Wood is a fossil that forms when dissolved solids in groundwater preciptate and replace woody material.
Acid testThe Acid Test: Geologists use dilute hydrochloric acid to identify carbonate minerals and detect their presence in rocks.
"The present is the key to the past."
Charles Lyell
New Articles & Updates
Earth's Largest Volcano? Tamu Massif is the "largest" but Mauna Kea and Ojos del Salado exceed Tamu in height and altitude.
Sand is an extremely diverse material. This gallery includes colorful photos of sand from many parts of the world.
Galena is a lead sulfide mineral, the world's primary ore of lead and an important ore of silver. Photo by Rob Lavinsky,
Dolostone is a sedimentary rock composed primarily of the mineral dolomite. It has a variety of industrial uses.
Eagle Ford Shale
The Eagle Ford Shale once attracted very little attention. Now it is one of the most prolific producers of oil and gas in the USA.
Dallol - Image © iStockphoto / Matejh Photography
Dallol Volcano is one of the strangest landscapes on earth. It is an explosion crater about 269 feet below sea level.
peridotitePeridotite is a chromite host rock, a source of diamonds and a possible sink for atmospheric carbon dioxide.
U.S. Gemstone MinesUnited States Gemstones: A diversity of gemstones are produced in the U.S. - mostly from very small mines and by rockhounds.
Ticks and Lyme DiseaseAvoiding Ticks and Lyme Disease: Geologists and others who work in the field should know about ticks and Lyme disease.
Rock ArtRock Art: People have been marking on rocks for thousands of years. Check out our petroglyph and pictograph galleries.
uses of marbleThe Uses of Marble are numerous and diverse. The most common are the ones that you might not know about.
tallest geyserSteamboat Geyser at Yellowstone produces eruptions over 300 feet high - making it the world's tallest geyser.
ChromiteChromite is the only economic ore of chromium metal and a mineral most often found in ultrabasic rocks.
chromiumAbandoned Mine Deaths: Between 20 and 30 people are killed in abandoned mine accidents each year - mostly by drowning.
Oil from Space at Night: These night views of Earth from the Suomi satellite show oil field illumination and natural gas flaring.
understanding past climate and ecosystems Understanding Past Climate and Ecosystems: A case study from deposits at the West Coast Fossil Park, South Africa by Alex Guth.
Labradorite Labradorite is a feldspar that can display a play of colors known as "labradorescence". Image © iStock / Joanna-Palys.
sunstoneSunstone is a feldspar that exhibits aventurescence caused by the reflection of light from plate-like mineral inclusions within the stone.
"Oil is found in the minds of men."
Wallace Pratt
For Teachers
Penn State World Campus
Teacher resourcesEarth Science Teaching Ideas: Links to some of our own ideas and the best that we could find on the web.
plate tectonics drawingTeaching Plate Tectonics: Ideas for teaching plate tectonics with easy-to-draw illustrations.
Mineral identification chartMineral Identification Chart Printable mineral ID chart by Art Crossman in MS Excel format.
Geologist Information
Geology Jobs
Geologist Salary Information
What Does a Geologist Do?
Geoscience Societies
Geology Schools
Geology Field Camp
Worldwide Geological Surveys

geology dictionaryGeology Dictionary:
Look up definitions in our free geology dictionary. Hundreds of geology term definitions at your fingertips.
geologic time scaleGeologic Time Scale: Printable time scale in MS Word format for teacher or student use.
Homeowners InsuranceHomeowners Insurance usually does not cover damage caused by floods, landslides, earthquakes and other geohazards.
OpalOpals: Gem quality opal is one of the most spectacular gemstones. A single stone can flash with every color of the spectrum.
coal through a microscopeCoal Through a Microscope: Coal is more than a black rock. It's THE most interesting rock.
goldGold: A survey of how gold has been an important metal for thousands of years. Learn about uses, prospecting, mining, more.
Earth Science Records
World's Highest Mountain
Highest Mountain on Each Continent
Deepest Point in the Ocean
World's Largest Lake
World's Highest Waterfall
World's Deepest Lake
World's Largest Desert
World's Largest Earthquake
World's Largest Tsunami
World's Largest Volcano
World's Largest Meteorite
World's Oldest Animal Fossils?
World's Largest Land Mammals
SuperSize Topo MapsSupersize Topo Maps: The folks at are now printing topo maps up to 5'x8' or 8'x5' in size. You can also get smaller maps and aerial photos. We are MyTopo affiliates.
Geology Tools
Geology tools
Geology Tools: Visit the store for rock hammers, hand lenses, field books and other tools for the geologist.
"The best geologist is the one who has seen the most rocks." Herbert Read
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