I read somewhere where rich hickey said:  


  "I think continuations might be neat
  in theory, but not in practice"


I am not familiar with clojure.
1. Does clojure have continuations?
2. If no, dont you need continuations? I have seen a lot of good examples especially from this guy. What is the alternative?
3. If yes, is there a documentation?


Question: Do volcano blast changes earth's course?
Answer: The effect would be less than that of the weather, or even large earthquakes.

By “earth’s course” you could mean earth’s orbit around the sun, the earth’s rate of rotation about its own axis, and the orientation of the earth’s axis relative to distant stars.

Any process that involves the redistribution of mass can affect the motion of the earth – an earthquake, a volcanic eruption, seasonal weather, ocean currents, or driving your car.  Although the effect can be calculated, the redistribution of mass by driving your car would much too small to measure using present technology.  The most advanced methods of measuring earth orientation were required to detect that the great 2011 Japan Quake shortened the length-of-day and moved the earth’s axis.  The effect of a volcanic eruption has not yet been measured.  Because a volcanic eruption would redistribute relatively less mass, the calculated effect of the event upon the oblateness and moment of inertia of the earth would be less than an earthquake and much less than seasonal weather.

The formation of a shield volcano the size of the Olympus Mons (on Mars) on Earth would change the Earth’s rotation from what it is presently.  The distribution of mass associated with the Yellowstone hotspot contributes to the Earth’s present moment of inertia.