- - helium, say, on a lake, is atmospheric
- - basic source of heat by a lake
- - basic source of heat - a pound
- - Basic cheese the French used for a month
- - A word that means simple and basic, or pertaining to forces of nature
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- - Nitrogen or helium, say
- - Bring up decline in nitrogen, say
- - Nitrogen's state of matter
- - Argon or ozone
- - struggle for breath almost in helium, perhaps
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- - sergeant is worried about neon and helium, say
- - Sergeant is mixing neon and argon
- - Argon and neon, e.g
- - Nonreactive elements, and what are hidden in the answers to 17-, 26-, and 47-Across
- - Helium, neon, argon, etc.
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- - Lake ...... (after translation, "Lake Large Lake")
- - US state and one of the Great Lakes
- - By surface area, Lake .... is the world's largest lake entirely in one country
- - US Great Lake
- - Lake by which Chicago stands
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- - News about violent riot, say -- uplifting, atmospheric stuff
- - About 78 percent of our atmosphere
- - Atmospheric gas
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- - Propane & helium
- - Helium & argon
- - helium, neon, argon, krypton, xenon and radon are the six noble ...........
- - Helium & hydrogen
- - Helium and nitrogen, e.g.
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