What happened to the appearance of 5 Paris sized craters in Greenland?

The 5 craters of Paris were actually caused by meteors.

I think it's a crater left over a long time ago, and it's only now been discovered.

Greenland, the world's largest island, has a giant meteor crater under the ice, an area the size of five Paris.

Grains of silicate minerals (usually quartz or feldspar) that have undergone high-pressure impacts caused by meteorite impacts may produce one or more sets of linear fractures parallel to different directions.

The discovery of PDFs in this book is sufficient to confirm that the circular depression was indeed formed by a meteorite impact. This diameter is found under the Greenland ice sheet.

The size of this crater is also revealed through radar data. Radar data shows that the crater is about 31 kilometers in diameter and more than 300 meters deep.

This diameter is the diameter of the crater after erosion, so it is possible to underestimate.

Large impact craters often have rocky backs after high-pressure impacts, and the elastic characteristics are consistent. Through "this circular depression found beneath the ice on the surface.

On the surface of the earth, there are very few craters that can be distinguished by the appearance of the straight ridge, unless it is some very young craters with obvious characteristics, such as the Arizona crater in the United States, which is only tens of thousands of years old, so the morphology is complete and the characteristics are obvious, but its diameter is only more than 1 kilometer, and its life span will not exceed hundreds of thousands of years. The craters with a diameter of more than 100 kilometers are all address structures left over from the end of the "Great Bombardment" 3 billion years ago.

The "Great Bombardment" is the scene at the end of planetary formation described by the Star Theory. At this time, the collision and merger of large stars with a diameter of hundreds or hundreds of kilometers has been completed, and the earth has begun to take shape, and small stars with a diameter of 10 to 50 kilometers (in fact, the predecessor of the asteroid, or large meteorites) continue to bombard the surface of the earth, constantly forming new craters and filling in the old craters. This is repeated until the asteroids in the central part of the solar system (near the Earth's orbit) are basically caught and there are no more large-scale impacts.

So the large craters that can be found so far are only the product of the final impact. Coupled with the earth's geological movements (plate movements), atmospheric activities, water activities, and biological activities, craters are eroded very quickly, and even large craters with a diameter of more than 100 kilometers generally do not have a lifespan of more than 1 billion years (it takes less than 3 million years to accumulate a Loess Plateau by wind alone) will be wiped out.

Despite this, the geological preservation of large craters is very long. For example, the Yucatan crater in Mexico is about 200 kilometers in diameter, but it is completely buried by limestone and can only be detected by drilling, remote sensing, etc.

The crater in the south of France, which you mentioned, probably refers to Rochechouart, with a diameter of 21 km and coordinates of 45° 49 27 N, 0° 46 54 E, you can look for it. If you don't have a car, the general satellite ** is estimated to disappoint you, and remote sensing ** is not something that ordinary people can get.