Mergers have left four airline companies controlling more than 80 percent of the U.S. market. And they have been very slow to add new flights. That makes planes more crowded. U.S. airlines are filling more than 85 percent of their seats in some months â close to record levels, according to the government.
Pluto is thought to be made of mostly ice. It probably also has a small rocky core which might contain some metals. The ice on the surface of Pluto is made of frozen nitrogen, methane and carbon monoxide.The ice covering Pluto reflects a lot of sunlight making it appear brighter than it would if it had been covered with a darker rocky material. 1  Javascript must be enabled to use Cool Cosmos.t probably also has a small rocky core which might contain some metals. The ice on the surface of Pluto is made of frozen nitrogen, methane and carbon monoxide. The ice covering Pluto reflects a lot of sunlight making it appear brighter than it would if it had been covered with a darker rocky material.
What Is Uranus Made Of. The standard model of Uranus is that it has a core of rocky material (similar to the mantle or crust of the Earth), an icy frozen mantle (mostly methane, ammonia, and water ice) and a gaseous hydrogen/helium atmopshere. it is mostly composed of various ices, like water, ammonia and methane.