Tektites (from Greek tektos, molten) are rather natural glass objects up to a few centimeters in size which were formed--according to most scientists--by the impacts of large meteorites on Earth's surface. _Wikipedia
Tektites (from Greek tektos, molten) are rather natural glass objects up to a few centimeters in size which were formed--according to most scientists--by the impacts of large meteorites on Earth's surface.
_Wikipedia