They are not.
Crater found ocean floor.
In the late 1990s scientists using ship mounted sonar found enormous craters more than 100 meters across and about 5 meters deep on the bottom of the pacific ocean.
These craters known as micro depressions were discovered during a series of underwater surveys.
3000 2800 bce meteorite impact event possibly resulting from a comet.
Geochemical analysis and local gravity readings told researchers that the crater lay in southern laos on the bolaven plateau.
A 250 million year old fault system supplying methane to enormous craters that line the floor of the arctic ocean has been discovered.
Hundreds of craters with some over 3 000 feet wide were.
Scientists have discovered more than 4 500 mysterious holes off the coast of big sur california.
Unlike the other 4 or so tektite strewn fields each of which can be traced back to a large impact crater the australasian field s source has yet to be definitively located.
Today more than 600 gas flares have been identified in and around.
While this proposal does not fully prove the case it offers strong evidence.
Officials say it is not like this is the work of men but also doesn t look like natural formation sic.
Eyewitness reports vary from smoke rising from the ground to celestial bodies impacting the earth shortly before the craters were found.
A paper published in science in 2017 described hundreds of massive kilometer wide craters on the ocean floor in the barents sea.
On the floor of lake neuchatel geologists have happened upon huge underwater craters some of the largest in the world to be found in lakes.
The russian academy of sciences lists the feature as a potential impact crater.
The ancient impact was concealed under a field of cooled volcanic lava.
Burckle crater is an undersea feature about 29 kilometres 18 mi in diameter in the southwestern indian ocean.
A crater at least 28 miles wide and 1 7 miles deep formed by the impact of a comet or asteroid 50 million years ago has been discovered on the sea floor 125 miles southeast of nova scotia.
In pnas sieh et al.
An unusual and unexpected discovery.