A default app is the program that Windows uses automatically when you open a particular type of file, such as a song, movie, photo, or webpage. For example, you might have more than one photo-editing app installed on your PC. You can choose one of them to be the default app that starts whenever you open a photo.
The Kerio Crater Lake in Iceland. The Kerio Crater Lake (sometimes spelled Kerid) is located in the GrÃ­msnes area in south Iceland, and is one of the most photogenic volcanic crater in existence. Itâs a regular stop for tourists along the Golden Circle sightseeing route and one of the most-photographed features in this amazing landscape.
Callisto is without a doubt the most heavily cratered object in the known solar system. This suggests that the surface is very old and inactive. The largest impact crater on Callisto is known as Valhalla. It is 2,485 miles (4,000 km) in diameter. Another large crater, Asgard, has a diameter of 994 miles (1,600 km).It appears that Callisto's surface has undergone very little change since its formation over four billion years ago.he largest impact crater on Callisto is known as Valhalla. It is 2,485 miles (4,000 km) in diameter. Another large crater, Asgard, has a diameter of 994 miles (1,600 km). It appears that Callisto's surface has undergone very little change since its formation over four billion years ago.