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Image of the Week: Antarctic ice-shelf thickness. Clues to the Earth's ancient core. Old rocks hold on to their secrets.

Clues to the Earth's ancient core

Now, a geophysicist at Michigan Technological University has unlocked clues trapped in the magnetic signatures of mineral grains in those rocks.. These clues will help clear up the murky history of the Earth's early core. The journal Earth and Planetary Science Letters published a paper on the subject earlier this year. Aleksey Smirnov, an associate professor of geophysics and adjunct associate professor of physics at Michigan Tech, led the study. The work is a part of a large research program led by Smirnov and supported by the National Science Foundation (NSF), including his CAREER Award, a prestigious NSF grant. Earth's Ancient Geodynamo The magnetic field comes from the earth's core: The solid inner core, made of iron, spins and powers convective currents in the liquid outer core.

Smirnov and his co-author, David Evans of Yale University, examined the paleointensity measurements of rocks more than two billion years old. Magnetic Records in Rocks. All of the world’s greenhouse gas emissions in one awesome interactive pie chart. The United Nations' Paris climate talks are less than six months away, and have been widely described as our best chance for an international agreement to curb the effects of global climate change.

All of the world’s greenhouse gas emissions in one awesome interactive pie chart

In order to reach that goal, we need to know who and where are the biggest emitters. The World Resources Institute (WRI) has built an open-source database to provide individuals, companies and governments with reliable data about climate change, called the CAIT Climate Data Explorer. If you’ve ever wished you could visualize all global emissions at once, WRI has just the tool, built from CAIT data. This interactive infographic takes a look at the world’s biggest emitters by country, along with the top emissions sources within each country, based on just-released information from 2012.

Maps Mania: The Geography of Everything. GroupLens from the University of Minnesota and the WebSAIL group at Northwestern University have just released a new map based search engine called Atlasify.

Maps Mania: The Geography of Everything

Atlasify lets you map just about anything. For example, search 'cricket' on Atlasify and you get a map of the world with a number of countries colored green. The dark green areas show locations around the world which are very related to 'cricket' and the lighter green areas indicate places that have a less strong relation. The map reveals that Australia, New Zealand, India, Pakistan, South Africa and England all have a very strong interest in cricket. If we search 'Mormonism' instead we find that the USA is the most related country. International Chronostratigraphic Chart "Version (v2015/01)" Arctic Ocean Seafloor Map: Depth, Shelves, Basins, Ridges.

Arctic Ocean: History and Now The Arctic Ocean has played a minor role in world history.

Arctic Ocean Seafloor Map: Depth, Shelves, Basins, Ridges

Ice cover severely hinders navigation; the area is remote; there is almost no infrastructure; winters are dark and very cold; summer days are short and foggy. These challenges make the Arctic Ocean a hostile and difficult area. Today, we are at a time when interest in the Arctic Ocean is growing steadily. A warming climate is thinning and shrinking the polar ice pack to allow increased navigation.

The new interest in the Arctic Ocean is not confined to its surface; it extends to the bottom where information about its structure is needed by geologists, oceanographers, biologists and other people who work there. This map will change how you see the world. Calling all geography nerds: The US Geological Survey has published a global ecosystems map which it says is the most detailed in the world.

This map will change how you see the world

The map is an interactive mosaic of 3.5 billion cells, detailing more than 40,000 unique ecological areas based on four different factors that determine the make-up of an ecosystem – bioclimate, landforms, rock type and land cover. Cartography nuts can use the browser to click on any spot of the map to be given a description of the ecosystem in that exact location as well as scroll through a selection of places the USGS has picked out for special mention (see examples below). The Association of American Geographers, which developed the new map with the USGS, explains it was created to allow scientists, land managers, conservationists, developers, and the public "to improve regional, national, and global resource management, planning, and decision making".

And we’re glad they did. National Geographic : un siècle du monde en cartes. New Scientist sur Twitter : "The great greening: The coming of our new lush Earth. Ciência Hoje no Tumblr — Viagem no tempo on-line e de graça Mapas não são... La otra cara de la Tierra en 10 mapamundi de la NASA – RT. Desde aquella impresionante foto del planeta tomada por el Apolo 17, las imagenes modernas nos permiten analizar la fenomenología de la Tierra de una manera más detallada.

La otra cara de la Tierra en 10 mapamundi de la NASA – RT

El portal Mother Nature Network presenta 10 impactantes mapas de otros tantos fenómenos que afectan a nuestro planeta. Incendios activos Los datos de este mapa fueron recogidos por el espectrorradiómetro de imágenes de resolución de los satélites de la NASA Terra y Aqua, y muestran los incendios activos en agosto de 2014. La mayor zona de fuego activo es la zona de África subsahariana, debido a los incendios de temporada de las sabanas. Temperatura anómala de la superficie del océano Este mapa muestra las anomalías en la temperatura superficial del mar en septiembre de 2011. Temperatura media de la superficie terrestre. Climate Change. Climate Change Impacts in Pictures: 8 Stark IPCC Images. By Brian Kahn and Andrea Thompson With 30 chapters that cite more than 12,000 scientific papers and reports, there’s a lot of material -- and a lot of words -- in the newly released Intergovernmental Panel on Climate Change report looking at the impacts of global warming.

Climate Change Impacts in Pictures: 8 Stark IPCC Images

IPCC Climate Change Is Destroying The Oceans. How Climate Change Is Devastating The World In One Map.