What scale is used to measure the hardness of minerals?

More Questions:

How many words rhyme with purple?

Who is credited with creating McDonald’s’ Big Mac?

Who met longtime best friend Gayle King in 1976?

In what year was Gettysburg National Military Park founded?

The Oshawa Generals is a junior ice hockey team located in what country?

Who began forty-five straight lines of his poem "Howl" with the word "who"?

What book facilitated the ban of the pesticide DDT in 1972 in the U.S.?

Pamlico Sound is located along the shores of which state?

The national currency of Panama is named for what Pacific explorer?

Mt. Rainier is one of sixteen volcanoes in the world that is classified as what?

What vehicle was driven by Jim Douglas?

Who provided the original voice for the character of Tigger?

Which grandson of Genghis Khan founded the Yuan Dynasty in China?

Who runs the "Leftorium"?

Which US state, now the second largest state, was once an independent republic?