Libyan Desert Glass is strewn over an area of hundreds of square kilometers in the Great Sand Sea, a region desolate even by the high standards of the Sahara. As
one account of a recent trip to acquire Libyan Desert Glass puts it: "Out there, death sits on your shoulder like a vulture." While some would have you believe that Libyan Desert Glass is
evidence of ancient atomic warfare, it is probably evidence of a
massive meteorite or comet explosion nearly thirty million years ago, similar to Tunguska, but much bigger. The stone age Aterian peoples made
tools from it, but the remoteness and inhospitality of the Great Sand Sea has ensured that until recent times it has mostly been undisturbed. However, a
breast ornament buried in Tutankhamen's tomb has a scarab made from Libyan Desert Glass, the only piece made of the material to have been found by Egyptologists, and
how Tutankhamen's jewelers acquired it has remained a mystery. Until
now.
[Previously]
posted by Kattullus
on Dec 8, 2011 -
38 comments
The Mississippi River has the third largest drainage basin in the world, exceeded in size only by the watersheds of the Amazon and Congo Rivers. It drains 41 percent of the 48 contiguous states of the United States.
The basin covers more than 1,245,000 square miles, includes all or parts of 31 states and two Canadian provinces. The US Government has tried to improve navigability of the Mississippi River and its major tributaries for more than a hundred years, focused in part by
Mississippi River Commission, created in 1879. The river is ever-changing, and in an attempt to understand their domain, and
in 1941, MCR hired Harold Norman Fisk to conduct a geological investigation of the Lower Mississippi Valley. The result was
a colorful map that displayed the historical course of the riverway from southern Illinois to southern Louisana. His vivid maps are
available online in full, but beware:
the files are very large.
posted by filthy light thief
on Sep 30, 2011 -
24 comments
SEED Magazine:
Wealth of Nations:
"Shared natural resources underpin the global economy, but our current economic system does not acknowledge their worth. Can a major new effort to assess the costs of biodiversity loss force a paradigm shift in what we value?" [more inside]
posted by zarq
on Nov 30, 2010 -
10 comments
Experts are little help in the constant struggle in this conversation to separate myth from reality, because they have the same difficulty, and routinely demonstrate it by talking past each other. Respected scientists warn of imminent energy shortages as geologic fuel supplies run out. Wall Street executives dismiss their predictions as myths and call for more drilling. Environmentalists describe the destruction to the earth from burning coal, oil, and natural gas. Economists ignore them and describe the danger to the earth of failing to burn coal, oil, and natural gas. Geology researchers report fresh findings about what the earth was like millions of years ago. Creationist researchers report fresh findings that the earth didn’t exist millions of years ago. The only way not to get lost in this awful swamp is to review the basics and decide for yourself what you believe and what you don’t.
[more inside]
posted by infinite intimation
on Jun 27, 2010 -
31 comments
The Polar Discovery team has documented science in action from pole to pole during the historic 2007-2009 International Polar Year, and
covered five scientific expeditions. The science projects explored a range of topics from climate change and glaciers, to Earth’s geology, biology, ocean chemistry, circulation, and technology at the icy ends of the earth. Through
photo essays and
other multimedia, they explain how scientists collected data and what they discovered about the rapidly changing polar regions. From the awesome folks at
WHOI.
posted by netbros
on Nov 9, 2009 -
4 comments
Waterlines is a new online exhibit from the excellent
Burke Museum at the University of Washington, Seattle. It tells the story of the land underlying Seattle, one of the United States' most geologically active city sites, and of the human attempts to engineer this landform. Closely related are the
archaeology of West Point and
Coast Salish Villages of Puget Sound (e.g., read the
story of North Wind and Storm Wind).
posted by Rumple
on May 2, 2009 -
3 comments
An erupting stratovolcano poses numerous hazards for nearby habitation, but none nearly so terrifying and deadly as the
pyroclastic flow.
Pyroclastic flows, comprised of tons of superheated sulfuric gases, particulate rock materials and ash, can reach temperatures of 1,830 °F and travel at alarming speeds up to 450mph. Convection of materials within the clouds causes them to become a suspension,
fluidizing and
thundering noxiously across the surrounding landscape for miles, in some cases even uphill or across open water. Wherever these clouds come in contact with humans the result is catastrophe, as the residents of
Herculaneum and
St. Pierre, Martinique learned within minutes of the eruptions of Vesuvius in 79AD and Pelee in 1902-- both towns were overwhelmed by pyroclastic clouds, igniting all flammable materials and incinerating and suffocating the inhabitants. None survived
Herculaneum, while just two of
St. Pierre's 26,000 survived, one of whom was a prisoner condemned to death and awaiting his execution in a dungeon cell. Despite their incredible capacity for violence, pyroclastic flows are also capable of producing
mesmerizing,
awe-inspiring beauty.
posted by baphomet
on Feb 18, 2009 -
18 comments
Science Hack is a unique search engine for science videos focusing on Physics, Chemistry, and Space. For example,
things to do with
sulfur hexafluoride. Still growing, the editors are presently indexing other scientific fields of study including Geology, Psychology, Robotics and Computers. Ever wonder
why things go bang?
posted by netbros
on Aug 7, 2008 -
6 comments
OneGeology is an international initiative of the geological surveys of the world which is taking the data from the individual surveys and combining their data into a consistent format to produce the first digital geological map of the world.
[more inside]
posted by shothotbot
on Aug 6, 2008 -
6 comments
Surtsey was first observed on November 14, 1963, as
a pillar of smoke on the water some ways south of Iceland. The very next day lava and tephra broke the surface of the Atlantic and by May, 1964 the formation had grown to 2.4 km². Over the next three years lava eruptions continued, coating the loose debris in a hard shell and protecting it from erosion.
An island born. Naturally, Surtsey has been under close scientific observation since its emergence, and courtesy
The Surtsey Research Society you can read published reports on the
geology and
biological colonization of this new earth.
posted by carsonb
on Jul 17, 2008 -
9 comments
Later this year, geophysicist Dan Lathrop's
DIY Planet Earth will be filled with liquid sodium, weigh in at 26 tons, and will be spun-up to 80mph at its equator in an effort to discover how the earth's magnetic field is generated. Currently undergoing tests, even those can be
pretty impressive.
posted by Kronos_to_Earth
on Jun 4, 2008 -
34 comments
In 1987, the Caltech biomagnetist and paleomagnetist Joe Kirschvink gave undergraduate Dawn Sumner a rock sample [from South Australia] to study for her senior thesis. The apparent glacial origin of this rock lead directly to the theory that periodically the Earth has been thoroughly glaciated from the poles to the Equator: the so-called
Snowball Earth events. A
website dedicated to this theory includes
detailed teaching slides,
a FAQ, and many other resources on this interesting period in Earth's history.
posted by Rumple
on Apr 21, 2008 -
7 comments
The Mystery of the
Sliding Rocks of Racetrack Playa.
One of the most interesting mysteries of Death Valley National Park is the sliding rocks at Racetrack Playa (a playa is a dry lake bed). These rocks can be found on the floor of the playa with long trails behind them. Somehow these rocks slide across the playa, cutting a furrow in the sediment as they move. Some of these rocks weigh several hundred pounds. That makes the question: "How do they move?" a very challenging one. [Via]. For more in-depth information, including maps and additional pictures, see
Paula Messina's website about the Sliding Rocks.
posted by amyms
on Dec 2, 2007 -
37 comments
