Why is it the 9th planet?

Because when the sun formed there where meteors going any way you can think of. Some of those meteors found a gravity spot and collected together. It could have been billions of miles from where it is now. When the Sun was done Pluto and Charon where done too and it ended up in the outer ring of our solar system.

Why is it a Dwarf Planet?

Pluto was made a dwarf planet in 2006. Pluto is not getting enough meteors to make it bigger. So it will not be a planet. If Pluto gets a little bigger it will be a planet again. Pluto shall be a planet to me no mater what size it is.

What is pluto?

Pluto is the coldest planet from the sun. Pluto is a rocky but mostly icey planet. It is the smallest planet in the SOLAR SYSTEM and 50 Plutos can go in Earth. Pluto has ice that is hard as rock .                                                                                                                                 

When it was found.

Pluto was found in 1930 by Clyde Tombaugh. He was looking for it for a year. Pluto is the 2nd non dwarf planet form the sun. The 1st non dwarf planet found was Ceres in 1801.

What Pluto does!

It takes Pluto 248 years to go around the sun. Pluto takes 6 days to spin around on its axis. Pluto takes 144 hours to spin on its axis. Pluto takes 8,640 min. to spin on its axis or 518,400 sec. or 51,840,000 mil sec. or 51,840,000,000,000 nano sec. to spin on its axis. In other words a really long time. It will take Pluto 167 more years to spin on its axis. Pluto is closer to the sun than Neptune for 20 years.

What is Pluto Made Of?

Pluto is made of ice and rock because it stays -365 F deg. below 0. Pluto is made of the leftovers of when the Sun was formed. Under the surface of Pluto is water. Because the core is hot it does not freeze. If Pluto got -94.F degrees more the atoms would stop moving.

Here is some stuff I found about what Pluto is made of. From a cool site my dad found.

Pluto's composition is unknown, but its density (about 2 gm/cm3) indicates that it is probably a mixture of 70% rock and 30% water ice much like Triton. The bright areas of the surface seem to be covered with ices of nitrogen with smaller amounts of (solid) methane, ethane and carbon monoxide. The composition of the darker areas of Pluto's surface is unknown but may be due to primordial organic material or photochemical reactions driven by cosmic rays.

Little is known about Pluto's atmosphere, but it probably consists primarily of nitrogen with some carbon monoxide and methane. It is extremely tenuous, the surface pressure being only a few microbars. Pluto's atmosphere may exist as a gas only when Pluto is near its perihelion; for the majority of Pluto's long year, the atmospheric gases are frozen into ice. Near perihelion, it is likely that some of the atmosphere escapes to space perhaps even interacting with Charon. NASA mission planners want to arrive at Pluto while the atmosphere is still unfrozen.

SourcePluto l Pluto facts, pictures and information. by nineplanets.org