The reason hard boiled eggs dont last as long as raw eggs is that in cooking the eggs, a natural protective chemical layer (produced by the mother hen) is washed off the porous eggshell, allowing germs to enter. Source(s): http://cookery.newarchaeology.com/how_lo... sugarice82 Â· 9 years ago.
Freebase(0.00 / 0 votes)Rate this definition: Song cycle. A song cycle is a group of songs designed to be performed in a sequence as a single entity. As a rule, all of the songs are by the same composer and often use words from the same poet or lyricist.
The nitrogen cycle. The nitrogen cycle. The nitrogen cycle is one of the 'magical' cycles of nature in which essential nutrients for life, such as nitrogen, are cycled between atmosphere, soil and water without the elements vanishing. It enables components such as nitrogen to be used for one generation and recycled for future generations.