What black stone is the most common volcanic rock on Earth?

More Questions:

What egyptian object is also known as "The Key to the Nile"?

In 1975, what re-opened after an 8 year closure?

What gives beer its distinctive bitter flavour?

How many beans of coffee are needed to make an espresso?

In Judaism, what day of the week is considered a day of rest?

Which famous painting was stolen from an Oslo museum in 1994?

What city is the capital of the US state of Kansas?

New York's Tribeca neighborhood is so named because it's the triangle south of what major street?

Ageusia is the loss of which sense?

Which African country was the setting for the TV serial "The Flame Trees of Thika"?

How many Grammy Awards did Frank Sinatra receive during his career?

How did actor Humphrey Bogart die?

Who produced the radio show "The War of the Worlds"?

In 1908 New York City passed the Sullivan Ordinance, which banned what?

Which Gabor sister, who passed away in December of 2016, was crowned Miss Hungary in 1936?