What was the first crater?
What was the first crater?
Yarrabubba crater
The Yarrabubba crater is an impact structure, the eroded remnant of an impact crater, situated in the northern Yilgarn Craton near Yarrabubba Station between the towns of Sandstone and Meekatharra, Mid West Western Australia. With an age of 2.229 billion years, it is the oldest known impact structure on Earth.
What is an impact crater and where are they found?
An impact crater is an approximately circular depression in the surface of a planet, moon, or other solid body in the Solar System or elsewhere, formed by the hypervelocity impact of a smaller body.
What is the crater wall?
Crater walls are the interior sides of a crater rim.
How is an ejecta blanket formed?
A blanket of ejecta is formed during the formation of meteor impact cratering and is composed usually of the materials of that are ejected from the cratering process. An ejecta blanket is deposited in the interior regions of the crater rim to the final crater rim and beyond the crater rim.
How can you tell which crater is older?
One criterion that works well is the presence or absence of smaller craters inside. If the crater is clean, it’s probably new. If it’s full of smaller craters, it’s old. This applies to planets and satellites with no atmosphere, or with a rarefied atmosphere.
What are impact craters caused by?
Craters produced by the collision of a meteorite with the Earth (or another planet or moon) are called impact craters. The high-speed impact of a large meteorite compresses, or forces downward, a wide area of rock. The pressure pulverizes the rock.
How are terraces created around the rim of an impact crater?
Walls – The interior sides of a crater, usually steep. They may have giant stair-like terraces that are created by slumping of the walls due to gravity.
Which produces an impact crater?
What is ejecta thickness?
Predicted average thickness of Imbrium ejecta at Apollo 15 is 812 m; at Apollo 14, 130 m; at Apollo 17, 102 m; and at Apollo 16, 50 m.
What is the ejecta of a crater?
The factors affecting the appearance of impact crater ejecta are the geology of the target surface and the size and velocity of the impactor. Impact ejecta on the rim of the Barringer Crater. The large rocks on the top of the rim were ejected upon the impact explosion from within the crater.
