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.
Ancient man first used native. or naturally occurring and relatively pure metals. such as gold, silver, and copper. Nuggets of. gold could be found mixed with the quartz. sands of river beds in many areas of the world. Such gold nuggets were hammered into decora-. tive shapes, but because of the low strength the.