What layer of the atmosphere is closest to the earth?

More Questions:

In NATO's phonetic alphabet, what is the letter "A" referred to as?

What is the hobby of a "twitcher"?

What year saw the release of the first Hot Wheels toy car?

Which cricketer is known as "The Cat"?

The Louvre is located in which European city?

Whose autobiography was entitled "The Long Walk to Freedom"?

Jefferson City is the capital of which US state?

The Columbia River flows into what body of water?

What was known as "Bolshaya Gora" when it was part of Russia?

What does the 49th parallel separate Montana from?

Along with Karl Marx, who penned "The Communist Manifesto" in 1848?

What year did Abraham Lincoln deliver the Gettysburg Address?

What US president loved Fresca so much he had a soda tap installed for the Oval Office?

The character Smike appears in which Dickens novel?

The beaver is the national emblem of which country?