Seafloor spreading at midoceanic ridges is how scientists first discovered the periodic reversal of what?

More Questions:

What two timezones are unique to Canada and not shared with the US?

Jean Paul Gaultier was hired as an assistant to what popular designer?

'Lorgnette" is the proper term for a pair of glasses with what?

What was the first flavor of the malt beverage named "Zima"?

In 1984, what computer company introduced the PC junior?

In which US state would you find Glacier National Park?

Minsk is the capital of which European country?

How many claws does a domestic cat have?

Ben Kingsley won an Oscar in 1982 for which movie directed by Richard Attenborough?

All of the clocks in Pulp Fiction are stuck at what time?

What movie did the villain Annie Wilkes appear in?

What was actor Stan Laurel's birth name?

'Fight the Power" was a 1990 hit for which group?

Which British telephone number first came into use in 1937?

Winkle is a species of edible what?