__ Borealis, Dancing Lights Display in the Sky
Puzzle 15 of Words ending with – ING Piece of Cake Pack
Question is: __ Borealis, Dancing Lights Display in the Sky
and the answer is: AURORA
Word Meaning:
AURORA — An atmospheric phenomenon created by charged particles from the sun striking the upper atmosphere, creating coloured lights in the sky. It is usually named australis or borealis based on whether it is in the Southern or Northern Hemisphere respectively.
Definitions from Wiktionary.