During ice ages landscapes are sculpted by the power of advancing glaciers. From rock scratches, to changing mountains and the formation of corries, cirques and aretes, through to the formation of valleys and fjords, the effects of past glaciations are evident across the northern hemisphere landscape. Perhaps not so familiar, drumlin fields are also vestiges of the erosive power of ancient ice sheets. Glacial deposits tend to be angular and poorly sorted, meaning they come in lots of different […]
Ever year around the end of February, after a long winter, Arctic ice reaches its maximum extent. This year that happened around Feb. 25, when it encompassed 14.54 million square kilometers of ice around the North Pole.
Sound like a lot? It’s not. Really, really not. This year’s maximum extent was the lowest on record.
The plot above shows the situation. The solid line shows the average ice extent over the year (measured from 1981–2010) and the gray area represents a
Scientists have created 3D images of tiny objects showing details down to 25 nanometres. In addition to the shape, the scientists determined how particular chemical elements were distributed in their sample and whether these elements were in a chemical compound or in their pure state.