They are annoyance cracks. Your plaster isn't going to fall off the walls and ceilings.
The cracks are caused by the house moving. Why it's moving is the question. Often it's because of high clay content in the soil your house is built over, or because of frost heave in the soil around your house.
Check out the thread entitled "Fixing Plaster Cracks Once and For All" just two threads below yours in this forum.
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New Mexico; the only state in the union where "he needed killin" is a legitimate defense in court.
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