Riachao Ring
Encyclopedia
Riachão Ring is a meteorite
crater (astrobleme)
in Brazil
.
It is 4.5 km in diameter and the age is estimated to be less than 200 million years (Jurassic
or younger). The crater is exposed at the surface.
Meteorite
A meteorite is a natural object originating in outer space that survives impact with the Earth's surface. Meteorites can be big or small. Most meteorites derive from small astronomical objects called meteoroids, but they are also sometimes produced by impacts of asteroids...
crater (astrobleme)
Impact crater
In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...
in Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...
.
It is 4.5 km in diameter and the age is estimated to be less than 200 million years (Jurassic
Jurassic
The Jurassic is a geologic period and system that extends from about Mya to Mya, that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic era, also known as the age of reptiles. The start of the period is marked by...
or younger). The crater is exposed at the surface.