What is a sinkhole? A geotechnical engineer explains

Sinkholes are back in the news after a 13-year-old boy fell down a two meter deep hole in a waterlogged football field in Sydney over the weekend. The boy reportedly sank further into the hole every time he tried to push ...

Mapping lava tubes on the moon and Mars from space

Sometimes, all you need for a new discovery is some creative math. That was the case for a new paper by Edward Williams and Laurent Montési of the University of Maryland's Department of Geology. They released a brief paper ...

Eight new deep-sea species of marine sponges discovered

Although marine sponges are widespread in the oceans, their biodiversity and distribution is still poorly known. Even though the Mediterranean Sea is the most explored sea on Earth, a study by Julio A. Díaz and colleagues, ...

Humans reached icy northern Europe in time of Neanderthals

Pioneering groups of humans braved icy conditions to settle in northern Europe more than 45,000 years ago, a "huge surprise" that means they could have lived there alongside Neanderthals, scientists said Wednesday.

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Cave

A cave is a natural underground void large enough for a human to enter. Some people suggest that the term cave should only apply to cavities that have some part that does not receive daylight; however, in popular usage, the term includes smaller spaces like sea caves, rock shelters, and grottos.

Speleology is the science of exploration and study of all aspects of caves and the environment which surrounds the caves. Exploring a cave for recreation or science may be called caving, potholing, or, in Canada and the United States, spelunking (see Caving).

This text uses material from Wikipedia, licensed under CC BY-SA