Günter, on Monday 02 December 2013, raised the interesting question of the difference between rubble and wreckage.
To answer that fully and to check the meanings more precisely so I was sure of myself I did some quick searches on www.duckduckgo.com.
Here are a portion of the results:
- n. A loose mass of angular fragments of rock or masonry crumbled by natural or human forces.
- n. Irregular fragments or pieces of rock used in masonry.
- n. The masonry made with such rocks.
- (noun) The act of wrecking or the state of being wrecked.
- (noun) Something wrecked.
- (noun) The debris of something wrecked.
along with a lot more information – you can see that rubble is the result of rock / masonry so by extension applies to buildings and wreckage implies that something has been wrecked or is a wreck like a ship, a car or a plane.
I hope that clarifies the situation.