Siljan Ring proved inconclusive. Drilling for natural gas was resumed in the late 2000s and continues as of mid-2012. The scientific premise for prospecting of this sort is based on the work of physicist Vladimir Kutcherov, who is cooperating with Igrene, the company financing the drilling operations. Siljan Ring The Siljan Ring () is a prehistoric impact crater in Dalarna, central Sweden. It is one of the 15 largest known impact craters on Earth and the largest in Europe, with a diameter of about . The impact that created the Siljan Ring occurred when a meteorite collided with the Earth's surface during
Aero Country Airport Aero Country Airport Aero Country Airport is a privately owned public airport in McKinney, Collin County, Texas, United States, located approximately west of the central business district. The airport has no IATA or ICAO designation. The airport is used solely for general aviation purposes. Aero Country previously used the FAA LID of TX05 until at least July 1997. The FAA LID of T31 was previously used for Port Isabel-Cameron County Airport in Port Isabel, Texas until at least July 1992. Aero Country Airport covers at an elevation of above mean sea level (AMSL), and has one runway: For the 12-month