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a rather large asteroid
Flint. Not sure what is meant about a large asteroid although there is an asteroid song by Keith Flint.
No. An asteroid can get captured by an asteroid and become a moon, but not the moon. Our moon is too large to be considered an asteroid.
No, an asteroid cannot destroy earth, but a large enough asteroid can have devastating effects on the life on Earth
go through the asteroidbelt until you find a large asteroid with a giant Crystal on it.
If the asteroid is large, its own gravity will pull it together, into a more or less spherical shape. With smaller asteroids, the gravity is not large enough, and the shape will be irregular.
An asteroid can indeed damage a planet when it strikes it. It is possible that an asteroid strike resulted in the dying off of the dinosaurs on Earth. There are certainly some large craters on Earth that are suggestive of asteroid strikes.
A large comet or asteroid striking earth
Usually by another asteroid moving through the belt and hitting one, creating a force to move an asteroid from its orbit. Also, if a large enough asteroid passes by, it is possible that the gravity that it generates could pull a few off.
It is the asteroid belt.
Asteroid
Meteoroids definitely fall to Earth as dust or small stones. To the best of our knowledge, no asteroid or comet has fallen to Earth within recorded history. But as large as they are, it's likely that a lot more than dust would survive a trip through the atmosphere by either of them.