This video shows the snowy landscape surrounding Kirkjufell Mountain, Iceland, where a steep pyramid-shaped peak rises beside ...

In many places, spring happens gradually. But in far-north Fairbanks, Alaska, birch and aspen trees often put their leaves out over a span of just 24-48 hours, a dramatic event known as "greenup." ...

Just last year, a massive landslide in Alaska triggered a megatsunami that researchers have now mapped and ...