Sublime

Glaciers can also alter the landscape in more subtle ways. As the ice progresses along a valley, it scrapes the ground and the earth, pebbles, rocks and boulders it removes are pushed ahead of it – much like a bulldozer. This advancing bank of loose material is known as a moraine. Eventually, the glacier will have to stop. Usually this happens when

Here’s another interesting thought. If glaciers started reforming, they have a great deal more water now to draw on—Hudson Bay, the Great Lakes, the hundreds of thousands of lakes of Canada, none of which existed to fuel the last ice sheet—so they would grow very much quicker. And if they did start to advance again, what exactly would we do? Blast

Like all glaciers, the Greenland ice sheet is made up entirely of accumulated snow. The most recent layers are thick and airy, while the older layers are thin and dense, which means that to drill down through the ice is to descend backward in time, at first gradually and then much more rapidly. About a hundred and forty feet down, there’s snow dati

the ice sheet’s surface. That summer—a record-breaker—Greenland shed almost six hundred billion tons of ice, producing enough water to fill a pool the size of California to a depth of four feet.