

When people in Naruto begin using high levels of chakra--such as when Naruto's
Kyuubi chakra comes out, rocks or other pieces of the terrain begin
levitating, as shown in this picture:

![Naruto](https://i.stack.imgur.com/6hQ7s.png)

Some of the rocks are circled to make them clear.

Why does this happen?


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naruto
Why do rocks start flying when high levels of chakra are being used?


Though I don't recommend to _reason_ such things since most of them are just
pseudo-science, in this case of levitating rocks, I think it's because the
strong streams of chakra sent out from the character caused strong twists of
wind, which crack the floor, then the chakra flows upwards (positive energy in
anime all tend to flow upwards), drawing the air and rocks up with it.

Despite the _reasoning_ I made, I tend to believe it's just a kind of visual
effect that commomly used in animes to make a better visual impact and
emphasize on how strong the power of this character/technique is.


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_Using basic real world physics and a force I would assume._

Basing this answer on comments above, if you notice power usually surges
upwards or in strong bursts be it controlled _(calm)_ or wildy _(in rage etc)_
, be it in the form of chakra, reiatsu or
[ki](https://anime.stackexchange.com/questions/2782/what-is-the-formal-term-
for-energy-in-dragonball-z). It is more than likely that the ground is not as
stable or firm as harder ground or not able to handle the force of the energy
_or_ there are loose bits around, thus it breaks up and goes upward _(or
flying madly away)_.

Drifting a bit from anime, on several occasions when [Superman was about to
fly](http://www.youtube.com/watch?feature=player_detailpage&v=-DaPBBOHfsA#t=85s),
as he crouches on the ground, you can see the energy being exerted from him as
small rocks slowly begin to rise and streams of air being pushed away, so it
doesn't just apply to anime or Naruto and Dragon Ball Z as you said you saw it
in Astro Boy.


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The nerd in me says:

Specifically, in the case Naruto, the anime goes out of their way to explain
the chakras of the body. They even go as far to explain the flow of energy
through the chakras. As such, as they draw energy into their chakras (both
from inside and outside their body), debris (rocks in this particular case)
also have that "draw" motion upwards.

Furthermore, since the movement of energy creates heat (evident in what
happens later in the series when Naruto generates too much energy and he burns
himself - trying not to spoil here), it stands to reason that the air around
him would also heat up - so debris again would already with the added chakra
pull + the hot air above it + color air below it, would help to lift it off
the ground. Similar to a hot air balloon ([hot air balloons
explained](http://www.real-world-physics-problems.com/hot-air-balloon-
physics.html))

The adult in me says:

Dramatic visual effects. There is no rationale behind it, just a common theme
you see in animes. But it's fun to make up reasons why!


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What I feel is that all these concepts have been created by keeping Chakra and
the concept of Aura in mind.  

What is an Aura?  
According to the Wiki

> Aura is a field of subtle, luminous radiation surrounding a person or object
> (like the halo or aureola in religious art).  
>

The size of an aura could be increased or decreased and it totally depends on
the life force of the person.  
What is chakra?  
According to the wiki

> Chakras are part of the subtle body, not the physical body, and as such are
> the meeting points of the subtle (non-physical) energy channels, called
> nadiis. Nadiis are channels in the subtle body through which the life force
> (prana), or vital energy moves

Now if we consider that in Naruto when he increases his chakra, i.e. his life
force increases which indirectly increases his aura dramatically (because of
the immense chakra of kurama). So what we can say is that, natural substances
like rocks and stones that come into the influence of the aura, react to the
life force of the user (here its Naruto).  
As we've seen in many anime's (for example DBZ) [In DBZ we can call chakra as
their energy]

![Super Saiyan](https://i.stack.imgur.com/dsmKo.jpg) Here you can see the aura
of Goku clearly, its direction is pointing north (upwards). So what we can
conclude is that, the aura (at least in anime) moves upwards.  
With this theory, I can say that whatever natural object that comes under the
influence of an aura with strong life force, MOVES UPWARDS!  
So the greater the aura and force, the more heavier objects would levitate.  


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