>>6905423>>6905419>>6905416GUYS ITS HAPPENING
When they examined the quartz sand, they found the type of deformation you'd find if there had been a massive impact some time ago. That was all the evidence the researchers needed: This depression was created by a meteorite — likely about 1 kilometer (0.62 miles) across and made of iron, based on the size of the crater and minerals found in the area.
http://www.sciencemag.org/news/2018/11/massive-crater-under-greenland-s-ice-points-climate-altering-impact-time-humans 