The definition of a finger is a digit on your hand or anything that looks like or functions like a finger. Thumb - The thumb is the short, stubby finger that can rotate in all directions (opposable thumb). The anatomical name for the thumb is the 1st finger.
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.
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.