Fill in the blank: The three major constituents of Earth's atmosphere are nitrogen, ___, and argon.
Oxygen (O₂) is the second-most abundant gas by volume after nitrogen. It makes up approximately 20.95% of Earth's atmosphere by volume.
Name the animal on the California state flag.
The flag derives from a short-lived revolt in 1846 when U.S. immigrants to the area north of San Francisco rebelled against Mexico, which at the time was in control of that territory.
First introduced in 1919, the Tank is a line of wristwatches made by what luxury goods manufacturer?
The watch gets its name from its resemblence to the tanks used on World War I battlefields.
The Chinchorro people, who lived on this continent, are most famous for creating the world's oldest mummies—predating the Egyptians by millennia.
The Chinchorro lived on the extremely arid Pacific coast of the Atacama Desert in northern Chile and southern Peru from about 7000 to 1500 BC.
Etiquette expert Judith Martin is better known by this pen name.
Martin began writing her advice column in 1978.
Check out 5Q on the iOS app store for additional gameplay features.