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Karst refers to any terrain where the topography has been formed chiefly by the dissolving of rock, primarily carbonates (such as limestone) and evaporites (such as salt). Landforms associated with karst include sinkholes, caves, sinking streams, springs, and solution valleys. Because of the unique geologic and hydrologic features associated with highly developed subterranean networks, the scope of problems related to the karst environment is large.
The topic of this category is existing craters on Earth, known or suspected of being formed by impact of an object from space.

For objects currently still in space, consider the category Science/Astronomy/Solar_System/Asteroids,_Comets_and_Meteors/Near_Earth_Objects.

For speculation on future impacts, consider the category Society/Future/Catastrophes/Large_Near_Earth_Object_Impacts.

more information (editors only)

Sufficiently powerful asteroid and comet impacts can change the surface of the earth, creating craters and modifying rocks and soil.
This category is for websites dealing with professional geomophology organizations.
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Last update: Sunday, January 19, 2014 6:54:15 AM EST - edit