Why is Pluto known as dwarf planet? Pluto is considered as dwarf planet because it has not clearedtge neighborhood around its orbit. It orbits in a disc-like zone beyond the orbit of Neptune called the Kuiper belt, a distant region populated with frozen bodies left over from the solar systems' formation.

Pluto is known as dwarf planet because it has not cleared the neighborhood around its orbit

Explanation:

Pluto is not considered a planet any more and it is called a dwarf planet because it does not meet one of the international astronomical Union criteria which is " it has not cleared it's neighbouring region of other object" which indicate that it has no gravitational dorminancy and it's tend to share it's orbital space with other neighbouring objects of the same size.

Pluto has mountains, glaciers and thin atmosphere.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.