We currently don't know, though they may have began in the big bang (the beginning of the universe) Preons are so small, if they even exist, that we may never know unless we build a supercollider as big as the solar system, I don't know if we could make one THAT big!!!!!!!!
GO TO SCHOOL
We don't know, because it is very hard to smash quarks together to see inside of them, since they cannot exist on their own, they must be incorporated into hadrons or mesons. We may be able to find out in the near future though.
No one investigating preons has suggested what they are made of. Additionally, the idea that preons, point particles, make up quarks has declined in subscribership over the last couple of decades. A point is a geometric locus, and it has no dimensions. If a particle is a point particle, it is possible that it doesn't have "component parts" by definition. The Large Hadron Collider may shed light on some aspects of the differences of opinion as regards the Standard Model. It comes online soon. They're still eradicating some bugs, but Spring of 2009 is a likely target date for operation. Who can't wait to see what is discovered!?
In particle physics, preons are "point-like" particles, conceived to be subcomponents of quarks and leptons.
Water molecules are circular. They have seven arms (called preons) that, when chilled, become sticky and elastic. This causes water to freeze together into a solid mass (a process technically called preonization). When an ice cube, held together by sticky preons, is warmed up by the ambient heat of a room (the reason rooms have this tendancy towards "room temperture" is complicated and involves the second law of thermodynamics) the preons lose their adhesive quality and, being round, begin to roll off each other. From our perspective they appear to melt, when in reality they are merely collapsing on a molecular level.
Quarks are elementary particles that make up protons and neutrons. They are believed to be made up of smaller particles called preons, but this has not been proven conclusively.
There's no actual evidence that quarks are not fundamental particles, so as far as we know there's nothing inside them, they just are. There are a couple of half-baked theories that quarks are actually made of "strings" or "preons" (on the scale from "crackpot" to "fully validated scientific theory", strings are somewhat more "baked" than preons are), but there's no real experimental evidence for it; we're pretty much still at the level of some guy in ancient Greece saying "yeah, dude, everything is made of atoms." Except in ancient Greek, of course.
it was formed by being formed
Gulfs are formed by erosion. Gulfs are formed by erosion.
starch is formed by fermentation.
The Spice Girls were formed by Chris Herbert.
Magnesium oxide is formed, i think(: