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The area near the Freeden Seamounts over 20,000 km 2 (7,700 sq mi) has a meteorite material surface density of 10–60 kg/m 2 (2.0–12.3 lb/sq ft). Of this, 87% is melted and 13% only fragmented. This area is the region of the Earth's surface with the highest known density of meteorite material coverage. [2] The disturbed sediment had three ...
Less than ten thousand years old, and with a diameter of 100 m (330 ft) or more. The EID lists fewer than ten such craters, and the largest in the last 100,000 years (100 ka) is the 4.5 km (2.8 mi) Rio Cuarto crater in Argentina. [2]
Recent extensive surveys have been done for Australian (2005), [2] African (2014), [3] and South American (2015) [4] craters, as well as those in the Arab world (2016). [5] A book review by A. Crósta and U. Reimold disputes some of the evidence presented for several of the South American structures. [6]
The impact was also monitored by devoted systems such as Nasa’s Scout and the European Space Agency’s Meerkat, both of which are used to monitor imminent impacts with Earth.
Some scholars have argued that an impact event in an ocean or sea may create a megatsunami, which can cause destruction both at sea and on land along the coast, [42] but this is disputed. [43] The Eltanin impact into the Pacific Ocean 2.5 Mya is thought to involve an object about 1 to 4 kilometres (0.62 to 2.49 mi) across but remains craterless.
The Karin family, formed 5.8 million years ago, and the Koronis family, formed 7.6 million years ago, account for a class of meteorites called H chondrites that represent 33% of known Earth ...
There are several lists of meteorite impacts of various types available: Category:Lists of impact craters contains lists on various planets, including Earth by continent; Meteorite falls are observed; Meteorite finds are rocks found on the ground which are geologically identified as meteorites; Meteorite contains lists of the most notable of ...
The evidence of the impact included chemical signatures of the meteorite, small spherical structures formed from rock melted by the impact, and chunks of seabed mixed with other debris churned up ...