Posts treating: "Earth"
Thursday, 23 April 2015
I remember very well watching the CBS Evening News 35 years ago on the first Earth Day. It was a major story, and I believe Walter Cronkite led the broadcast with it. We know a lot more about our planet now than we did then, and there have been some amazing successes in protecting our environment. We now know something that was not well understood then, and that is the
Changing the picture of Earth's earliest fossils (3.5-1.9 Ga) with new approaches and new discoveries. 2015. PNASNew analysis of world-famous 3.46 billion-year-old rocks shows that structures once thought to be Earth's oldest microfossils do not compare with younger fossil candidates but have, instead, the character of peculiarly shaped minerals.
imageIn 1993, US scientist Bill Schopf
Happy Earth Day, everybody! Have you paused for a moment and considered what a nifty planet we live on? It’s got all kinds of great stuff! I’ve shared a few of my favorite places for an...
-- Read more on ScientificAmerican.com
n einer Studie, die jetzt in der Zeitschrift Earth-Science
Reviews erschienen ist, befassen sich Prof. Dierk Hebbeln und Prof.
Elias Samankassou, Universität Genf, mit der Entstehung von
Kalkschlammhügeln im Meer. Diese massiven, kegelförmigen und bis zu 350
Meter hohen Erhebungen finden sich weltweit in den Ozeanen. Sie
beherbergen faszinierende Ökosysteme und bieten Platz
Today's new ELI addresses the common misconceptions about weathering and erosion.
Textbook surveys have shown that misconceptions between weathering and erosion are common, when the scientific consensus is clear:-
- Weathering is the break up and break down (physical break up and chemical breakdown) of rocks at the Earth’s surface without the removal of solid material (although material can
Ocean acidification and the Permo-Triassic mass extinction. 2015. Clarkson, et al. Science
Art by Basil WolvertonChanges to the Earth's oceans, caused by extreme volcanic activity, triggered the greatest extinction of all time 252 million years ago that wiped out more than 90 per cent of marine species and more than two-thirds of the animals living on land.Abstract: Ocean
Looking is never just looking. When we gaze at something, we are not passive recipients of an image, instead our brain is constantly looking for patterns. If you are drifting over the earth, whether as an astronaut or via Google Maps then … Continue reading
Well it’s that time of year again. Happy April everyone! With the April flowers come Earth Day celebrations. While the official Earth Day is April 22, Houstonians like to celebrate Earth Day every weekend in April. Even better, all these … Continue reading
Bath Geological SocietyThursday April 2nd Nanoparticles in Sandstone GroundwatersProfessor John Tellam, Water Sciences (Hydrogeology), School of Geography, Earth and Environmental Sciences, University of BirminghamThe talk will cover both manufactured nanomaterials and viruses, and what has been discovered about their mobility in the subsurface.7.30 p.m. BRLSI, 16 Queen Square, BathEveryone welcome - visitors £4 - free
There are fewer people connected to nature now than ever before—and no one connected to it in the same way as the Hadza. One of the last hunter-gather groups on earth, the Hadza have lived sustainably off the bounty of … Continue reading
Hutton (June 3, 1726 - March 26, 1797) is considered to be the father of modern geology. He is accredited with proposing that observed geologic processes have been occurring at a uniform rate since the creation of earth, also know as the theory of unconformities. This led to his controversial suggestion that the earth is incredibly old.
Hutton began to notice geologic processes on his land
The earth sciences program at the University of Arizona (Geosciences Dept.) was ranked #7 in the U.S. by US News & World Report in new rankings. ASU ranked #16 (School of Earth & Space Exploration).
UA Geosciences' Geology program ranked #3 and was #8 in Geophysics and
The Atlantic overturning is one of Earth’s most important heat
transport systems, pumping warm water northwards and cold water
southwards. Also known as the Gulf Stream system, it is responsible for
the mild climate in northwestern Europe. Scientists now found evidence
for a slowdown of the overturning – multiple lines of observation
suggest that in recent decades, the current
Paleomagnetism is the study of the Earth’s ancient magnetic field. Such studies have helped lead to important discoveries like seafloor spreading and plate tectonics. Here on the JOIDES Resolution during Expedition 354, one of the main uses of this tool is to find out the age of sediments from the Bengal submarine fan. So how do we actually do that?
Much of the earth’s surface is covered by sedimentary rocks. These form as sediment settles on the surface. As the types of sediment change – sand to mud to sand again – different layers are formed, some hard some soft. The … Continue reading
Two coronal mass ejections over the weekend have arrived at Earth, and are producing a severe geomagnetic storm this evening. Besides causing long-range radio/GPS communication problems, it is already lighting up the aurora, and there is a decent chance of seeing the sky dance with a colorful display of the northern lights later tonight. A good measure of your chance to see the lights is the Kp index, and as
Hurricanes require moisture, the rotation of the Earth, and warm ocean temperatures to grow from mere atmospheric disturbances into tropical storms. But where do these storm cells originate, and exactly what makes an atmospheric disturbance amp up full throttle?
A new study accepted for publication in Geophysical Research Letters finds most hurricanes over the Atlantic Ocean that eventually make landfall in North America actually start as intense thunderstorms in western
GeoLog-The official blog of the European Geosciences Union [2015-03-16 12:54:47]
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(23 visits) Cretaceous; ID,CN,KM,SJ,HK
The Svalbard archipelago is considered to be one of the best places to study the geological history of the Earth because its rocks represent every geological period. This image shows a view from the peak of Fugleberget (569 m a. s. l.; 77º 00’ N, 15º 30’ E) on the south-western coast of the island of Spitsbergen. Glaciation of this geologically diverse area gave rise to a variety of geomorphic features. The most prominent of them, depicted in the picture, is the Hornsund Fjord that cuts [...]
Today's new ELI is 'Isostasy 1; modelling the state of 'balance' of the Earth's outer layers'. Isostasy is essentially the principle of hydrostatic equilibrium applied to the Earth, otherwise called ‘buoyancy’. You can model this principle using wooden blocks floating in water and in a denser medium.
Lots of activities about the structure of the Earth can be found on our
At the age of 105, Inge Lehmann (1888-1993) looked back on a long, productive life with satisfaction. During her career in seismology, she had made two major discoveries and made other significant...
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