analog models
When I was a teenager, I spent a couple of hours dropping large rocks off a bridge into mud flats, about 50 feet below. I was studying how impact craters form. Not only was it interesting, it was fun. It was in a very remote place out in the country.
Most of the rocks were small. There were a few bowling ball size rocks that I dropped. With help from a friend we dropped a hundred plus pound rock and covered the place in mud. Nice crater, thou.