Google Earth - FreeFree Google Earth
software allows you to browse seamless world satellite images. Free.
Spatter ConesSpatter Cones
are small, steep, volcanic cones built of welded basaltic lava.
is a metal used in coins, electronics, pipes, wiring, motors, alloys and many other products.
- Articles about volcanoes, volcanic hazards and eruptions past and present.
Uses of MarbleThe Uses of Marble
are numerous and diverse. You will be surprised by how it is used.
Debris FlowsDebris Flows
are moving masses of loose mud, sand, soil, rock and water.
Rare Earth ElementsRare Earths
- Special materials used in electronics, defense, medical & many other products.
Fire OpalFire Opal
is a transparent to translucent opal with a yellow, orange or red background color.
is metamorphic rock formed when sandstone is subjected to heat and pressure.
Crater of DiamondsCrater of Diamonds
- The only diamond mine in the world where you can be the miner.
is a byproduct of the natural gas industry. Its most important use is in MRI.
Pyroxene MineralsPyroxene Minerals
are a group of chain silicate minerals found in igneous and metamorphic rocks.
Hardness PicksHardness Picks
- Test for hardness with precise and easy-to-use hardness picks.
Rock and Mineral KitsRock & Mineral Kits
The best way to learn about rocks and minerals is with specimens!
Phytoplankton BloomsPhytoplankton Blooms
are caused by an explosive growth rate of plankton in surface waters.
- Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Crystal HabitCrystal Habit
is the external shape displayed by a crystal or an aggregate of crystals.
is the primary ore of zirconium and a gemstone that is available in many colors.
Types of MapsTypes of Maps
- Explore some of the most popular types of maps that have been made.
is a diverse material. This gallery includes photos of sand from around the world.
Mineral HardnessMohs Hardness Scale
is a set of reference minerals used for classroom hardness testing.
Largest HurricanesLargest Hurricanes
Are they determined by wind speed, value of damage, most deaths?
Map of the OceansMap of the Oceans
- showing the Atlantic, Pacific, Indian, Arctic, and Southern Oceans.
Geology ToolsGeology Tools
Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Ruby and SapphireRuby and Sapphire
are the 2nd and 3rd most popular colored stones in the United States.
- A porous limestone composed almost entirely of fossil debris.
Blue FlamesBlue Flames
and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Tallest TsunamiTallest Tsunami
- A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
The Acid TestThe Acid Test
- Geologists use dilute hydrochloric acid to identify carbonate minerals.
Volcanic ExplosivityVolcanic Explosivity
- Rating volcanic eruptions based upon the volume of tephra ejected.
Fool*s GoldFool*s Gold
is a name used for pyrite when its brassy color fools people looking for gold.
Mount EtnaMount Etna
- The most active volcano in Europe continues an eruption that started in 2001.
- the volcanic rock that cools so quickly that it becomes a natural glass.
Teacher ResourcesTeacher Resources
- K-12 resources for teaching about earth science.
Rock TumblersRock Tumblers
- All about rock tumblers and rock tumbling. Read before you buy a tumbler.
OpalsPictures of Opal
- A collection of different types of opal from all around the world and Mars too!
- the only important ore of mercury. Used in pigments until its toxicity was realized.
Wall MapsWall Maps
- Wall maps of the world, continents, states and the USA.
Utica ShaleUtica Shale
is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
are amorphous naturally-occurring inorganic solids that lack crystallinity.
- Learn about the properties of diamond, its many uses, and diamond discoveries.
Watch out for Ticks!Ticks
are a problem for geologists in some areas. Learn to recognize and avoid them.
Mars MeteoritesMars Meteorites
Mars rovers have found dozens of meteorites while exploring the red planet.
are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.
is a feldspar mineral that sometimes exhibits an iridescent play-of-color.
US Diamond MinesUS Diamond Mines
- Did you know that diamonds have been mined in the United States?
Colored DiamondsColored Diamonds
are diamonds with a noticeable body color. They can sell for over $1M/carat.
is a metamorphic rock with properties that make it suitable for a variety of projects.
is the third hardest mineral. It is also the mineral of ruby and sapphire.
Plate TectonicsPlate Tectonics
- Articles and maps about plate tectonics and the interior of Earth.
- a manganese mineral used as an ore, a pink gem and an ornamental stone.
What Is The Moho?What Is The Moho?
The Mohorovicic Discontinuity is the mantle/crust boundary.
American GemstonesMined in America
- Small mines in the United States produce a diversity of beautiful gemstones.
Underwater VolcanoHawaii*s Next Island
could be growing in the Pacific Ocean right now. Its name is Lo*ihi.
- The most important ore of copper for over five thousand years.
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Ethiopian OpalEthiopian Opal
- The new opal heavyweight that might give Australia a run.
June 6th 1912Novarupta
- The most powerful volcanic eruption of the 20th century occurred in the U.S.A.
is a purple silicate mineral, found only in Russia, used as a gem material.
- Colorful images and articles about diamonds and colored stones.
- The intrusive igneous rock that underlies continents and countertops.
Lapis LazuliLapis Lazuli
- a metamorphic rock and the most popular blue opaque gemstone in history.
Field CoursesField Courses
- Over 80 field courses for undergraduate geology students.
Grape AgateGrape Agate
is a popular mineral specimen with the color and the shape of a bunch of grapes.
- The rock that has quickly transformed the oil and gas industry.
- an extremely colorful mineral and gem material.
Gem SilicaGem Silica
is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Tallest MountainTallest Mountain
- Everest has rivals in tallness, altitude and distance to the center of Earth.
Herkimer DiamondsHerkimer Diamonds
Doubly-terminated quartz crystals used as specimens and gems.
- The most important ore of iron. A source of mineral pigment since prehistory.
- Used as an ore of copper, a pigment, ornamental stone and gem material.
100+ Gemstones100+ Gems
- Photos of over 100 beautiful gems ranging from the popular to the obscure.
Lightning Strikes MapLightning Strikes Map
by NASA shows the worldwide distribution of lightning activity.
Rock ArtRock Art
- People have been marking on rocks for thousands of years.
Hand LensHand Lens
A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Methane HydrateMethane Hydrate
deposits contain more fuel value than all other fossil fuels combined.
look like ordinary rocks on the outside but can be spectacular inside!
Ant Hill GarnetsAnt Hill Garnets
- tiny gems that ants haul to the surface and discard on their anthill. Honest!
is the most popular green gemstone in the United States and most of the world.
Mineral RightsMineral Rights
- Who owns the minerals under your land? Who wants to buy them?
is the transparent variety of quartz with a yellow to orange to reddish color.
Gifts That RockGifts That Rock
- What are the most popular gift items in the Geology.com store?
- Rocks that were once parts of planets or large asteroids.
Rock SaltRock Salt
is a sedimentary rock composed of the mineral halite. It has many uses!
Expansive SoilExpansive Soil
causes more damage than floods, hurricanes & tornadoes combined.
Tallest WaterfallAngel Falls
in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
Cave of the HandsCave of the Hands
is a cave where ancient people painted hands about 9000 years ago.
- A bluish-green gem material that has been used for over 6000 years.
Geology BooksGeology Books
- A variety of books for reference, field trips, reading and more.
Fluorescent MineralsFluorescent Minerals
and rocks glow with spectacular colors under ultraviolet light.
Waterproof PaperWaterproof Paper
- Don't take chances with your field notes and maps. Use waterproof paper.
Largest VolcanoesLargest Volcano
- That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
UV Mineral LampPortable UV Lamp
- Short and long wave UV for fluorescent mineral viewing.
An extrusive igneous rock with a high silica content, produced from granitic magma.
was unknown until a few decades ago but it has erupted into wide popularity.
is a variety of limestone formed from fine-grained marine sediment known as ooze.
is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Uses of TalcTalc
is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
What is a Maar?What is a Maar?
The second most common volcanic landscape feature on Earth.
- Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
Storm SurgeStorm Surge
can be the most damaging and deadly aspect of a hurricane.
Mount VesuviusMount Vesuvius
- geology, history, maps, facts and more about the Vesuvius eruptions.
Petrified WoodPetrified Wood
is a fossil that forms when silica replaces and infills the cavities of wood.
- The primary ore of titanium and source of most titanium dioxide.
Don*t Go To JailKnow the Rules
before removing rocks, fossils or minerals from public or private property.
Rocks on MarsRocks on Mars
Many of the rocks found on Mars are not very different from Earth rocks.
Cinder ConesCinder Cones
are the smallest, simplest, and most common type of volcano.
Homeowners InsuranceHomeowners Insurance
might not cover earthquake, hurricane and other geohazard damage.