What kind of tree is the oldest tree which has been discovered in the United States?

Where is the Petrified Forest National Park in the United States located?

Which of the world's rivers has more tributaries than any other?

True or False: Nothing can live in the Dead Sea because of its super-salty nature.

What is the lowest point on the earth's land surface?

A magnificent jade-topped mausoleum was discovered in Samarkand, Uzbekistan by Russian archaeologists in 1941. Who is buried in the tomb?

This spectacular site in Australia, considered to be close to that country's geographical center, is a sacred place that the Aborigines revere. What is this natural landmark called?

Where is the Blue Grotto located?

What is the name of the spot on land that is nearest to where zero latitude meets zero longitude at zero altitude?

True or False: Because of the vast volume of water pouring over the Canadian and American sides of Niagara Falls, the falls themselves will never dry up.

What is the name of the site in Greece where no 'woman, female animal, child, eunuch, or person with a beardless face' was allowed to set foot on?

What is the largest excavation ever dug without the use of machinery?

Which of the following is NOT one of the Seven Wonders of the Ancient World?

The largest hot desert on earth is the Sahara in North Africa. Do you know what the second largest hot desert is?

What is the name of the world's longest glacier?

This North American city sits on top of an underground reservoir and is believed to be sinking into the earth at the rate of 6 to 8 inches per year.Which is the city?