Why does this for loop crash my unity?

I’m trying to fill a 100 by 100 square with blocks but when i do this it crashes my unity.

var Land : GameObject;

function Start () {

}

function Update () {
for(var x : int = 0; x < 100; x++)
    {
		for(var y : int = 0; y < 100; y++)    
				newObject=Instantiate(Land);
                Land.transform.position = Vector3(y, 0, x);    
                
        }
}

You’re modifying the prefab! Modify the newObject block instead:

   for(var y : int = 0; y < 100; y++)    
      var newObject: GameObject = Instantiate(Land);
      newObject.transform.position = Vector3(y, 0, x);    
   }