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Steep hillsides and mountainsides in many regions worldwide are often covered in characteristic step-like patterns, also known as terracettes. These repeating landforms have fascinated scientists for more than a century, yet the factors contributing to their formation had not bee

Some 44 million Americans were under a heat wave warning Saturday as temperatures in the Rocky Mountains and northern Plains of the United States were expected to hit 43°C (110°F) over the weekend.

As US water wars rage, a tributary of the Colorado River faces unprecedented pressure. Visitors worry how long this aquatic ‘relict’ will lastOn an early morning in mid-May, a group of near strangers shoved camping gear and clothes into waterproof bags, slathered on sunscreen, an

When you think of a South American rainforest, you probably don't imagine biting winds, heavy frosts and freezing temperatures. But in the mountains of southern Brazil, that's exactly what you can find. On this highland plateau, far from Amazonia in the country's coldest region,