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A Geophysicist*s Perspective on Mount Hood Monitoring Stations and the Recent Earthquake Swarm
United States Geological Survey

Mount Hood is a potentially active volcano in the Cascade Volcanic Arc of the western United States. Photograph of Mount Hood by Walter Siegmund, displayed here under a Creative Commons License.
United States Geological Survey

Mount Hood is a potentially active volcano in the Cascade Volcanic Arc of the western United States. Photograph of Mount Hood by Walter Siegmund, displayed here under a Creative Commons License.
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100+ Gemstones

100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Crater of Diamonds

Crater of Diamonds - The only diamond mine in the world where you can be the miner.
Rare Earth Elements

Rare Earths - Special materials used in electronics, defense, medical & many other products.
Pyroxene Minerals

Pyroxene Minerals are a group of chain silicate minerals found in igneous and metamorphic rocks.
Don*t Go To Jail

Know the Rules before removing rocks, fossils or minerals from public or private property.
Horizontal Drilling

Horizontal Drilling has opened new resources and significantly improved productivity.
Fire Opal

Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Ruby and Sapphire

Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Rock and Mineral Kits

Rock & Mineral Kits The best way to learn about rocks and minerals is with specimens!
Lo'ihi Seamount

The Next Hawaiian Island could be growing in the Pacific Ocean right now. Its name is Lo'ihi.
Record Lightning

World Record Lightning - this lake has more lightning than any other place in the world.
Uses of Talc

Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
Rock Tumblers

Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Volcanic Explosivity

Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
Mineral Hardness

Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Fool*s Gold

Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold.
Tallest Tsunami

Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Morganite

Morganite is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
Opals

Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
American Gemstones

Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.
Mars Meteorites

Mars Meteorites Mars rovers have found dozens of meteorites traveling around the red planet.
Rhyolite

Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
The Acid Test

The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Utica Shale

Utica Shale is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
Birthstones

Birthstones are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.
Cinnabar

Cinnabar - the only important ore of mercury. Used in pigments until its toxicity was realized.
The Brewery Rock ?

The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.
Ant Hill Garnets

Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!
Largest Diamonds

World*s Largest Diamonds Records for the largest rough, faceted and carbonado diamond.
Google Earth - Free

Free Google Earth software allows you to browse seamless world satellite images. Free.
What is Geology?

What is Geology? The study of Earth materials, structures, processes and life over time.
Fluorescent Minerals

Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Hand Lens

Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Colored Diamonds

Colored Diamonds are diamonds with a noticeable body color. They can sell for over $1M/carat.
Sliding Rocks

Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?
Waterproof Paper

Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Gems from Space

Extraterrestrial Gems - A number of materials from space are used as attractive gems.
Mount Etna

Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
Peridotite

Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Tallest Mountain

Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Watch out for Ticks!

Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Coal Close Up

Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.
The British Isles

Names Used for Great Britain, British Isles, United Kingdom, and Ireland. What they mean.
Great Rift Valley

The East Africa Rift System - The extensive fault system that is tearing Africa apart.
Cave of the Hands

Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Greatest Ocean Depth

Deepest Point in the Ocean The deepest point in the ocean is in the Mariana Trench.
Lightning Strikes Map

Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.
Earthquake Maps

California Earthquake Maps - A collection of isoseismal maps for earthquakes in California.
Petrified Wood

Petrified Wood is a fossil that forms when silica replaces and infills the cavities of wood.
Grape Agate

Grape Agate is a popular mineral specimen with the color and the shape of a bunch of grapes.
Molybdenite

Molybdenite is the primary ore of molybdenum which is used in superalloys and as a lubricant.
Largest Volcanoes

Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Soapstone

Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Gem Silica

Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Homeowners Insurance

Homeowners Insurance might not cover earthquake, hurricane and other geohazard damage.
Methane Hydrate

Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
Tallest Waterfall

Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
Largest Hurricanes

Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
Mount Cleveland

Mount Cleveland is an active volcano in the Aleutian Islands and a threat to air traffic.
Hawaiian Hot Spot

How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
Hydraulic Fracturing

Hydraulic Fracturing increases well yield by fracturing the reservoir rock with fluid injection.
Rhodochrosite

Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
What Is Earth Science?

What Is Earth Science? The study of Earth and its neighbors in space. Learn more!