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Guatemala City Sinkhole

The appearance of a massive sinkhole in Guatemala City (map), Guatemala, on Sunday is thought to have been triggered by tropical storm Agatha, a violent tempest that struck Central America over the weekend.

From photographs, the new Guatemala sinkhole appears to be about 60 feet (18 meters) wide and about 300 feet (100 meters) deep, said James Currens, a hydrogeologist at the University of Kentucky—which explains how the sinkhole was reportedly able to swallow an entire three-story building.

Sinkholes can form when water-saturated soil and other particles become too heavy and cause the roofs of existing voids in the soil to collapse, Currens said.

Another way sinkholes can form is if water enlarges a natural fracture in a limestone bedrock layer. As the crack gets bigger, the topsoil gently slumps and develops into a sinkhole.

In either case, the final collapse can be sudden, Currens said.

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Nature & Adventure

The beauty of lotus at West Lake

The beauty of lotus at West Lake

There are many beautiful flowers in Hanoi. However, the lotus leaves the deepest impression. When the lotus blooms, many people, especially the youth, go to West Lake to enjoy the healthy atmosphere and to escape the noise and dust of the city.<br>