Impact craters on earth: the largest impact crater on earth is the Vredefort crater in free state, South Africa, it is the earths 1st largest and 2nd oldest known crater at 186 miles across and 2.02 billion years old.
Scientists believe that over 2 billion years ago an enormous asteroid anywhere from 6.3-9.3 miles in diameter struck what is now South Africa's free state providence, leaving a crater about 186 miles in diameter, although it is mostly eroded away, it is believed to have been closer to a diameter of 190 miles across when it was "new." and made the hole 10 times deeper than the grand canyon. This crater is one of the earths few multiple-ringed impact sites left due to erosion and tectonic plates.
Named after Giovanni Schiaparelli, the crater is 281 miles in diameter. A crater within Schiaparelli shows many layers. Layers suggests that ancient climate change on Mars, caused by regular variation in the planet's tilt, may have caused the patterns in layers.
located right near the equator of mars, Schiaparelli is around 500 ft deep (so say satellite images but there is no evidence as of yet to know how old the crater is or what exactly caused it other than an asteroid impact.