The top routes that United Airlines flies are: 1  CLT to ORD with 3,755 flights per month. 2  CLT to IAH with 3,511 flights every month. 3  DFW to ORD with 3,486 flights every month.  DFW to EWR with 3,268 flights every 1  month. PHL to ORD with 3,238 flights every month.
The first of the three rock types to form on Earth were the igneous rocks; formed from the cooling and solidification of magma, as the Earth was at one time completely molten. â¦. 4 people found this useful.
These rocks, known as faux-amphibolites, may be remnants of a portion of Earth's primordial crust -- the first crust that formed at the surface of our planet. The discovery of rocks as old as 4.28 billion years pushes back the age of the most ancient remnant of Earth's crust by 300 million years. Researchers have discovered the oldest rocks on Earth -- a discovery which sheds more light on our planet's mysterious beginnings.