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On This Date In History
  • Automotive
  • Entertainment
    • Movies
    • Music
    • TV
  • History
    • American History
    • Inventions
    • U.S. Presidents
  • Sports
    • Baseball
    • Basketball
    • Football
    • Golf
  • Toys & Games
  • General
    • Bible
    • Food/Drink
    • Geography/Landmarks/Monuments
      • Landmarks
    • Science
      • Animals
      • Health
  • Decades
    • 1950’s
    • 1960’s
    • 1970’s

What is the layer which protects Earth from harmful rays?

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