01·Which river, originating in the Peruvian Andes, is considered the main-stem source of the Amazon River?
02·The ancient Sumerian city of Ur was situated on a now-extinct channel of which major river?
03·In glacial geology, what is the term for a mountain pass formed by two cirque glaciers eroding back to back?
04·In James Hilton's 1933 novel "Lost Horizon," the fictional paradise of Shangri-La is located in which mountain range?
05·Germany's Ruhr industrial region is named after the Ruhr River, which is a major tributary of what larger river?
06·Which pharaoh of the 18th Dynasty moved Egypt's capital from Thebes down the Nile to a new city he founded, Akhetaten?
07·What is the geomorphological term for a river that is older than the geological structures, such as a mountain range, that it flows through?
08·Who led the first documented European expedition down the entirety of the Amazon River in 1541-1542?
09·The second-longest river in Africa, the Congo, is uniquely deep, reaching over 220 meters in a section known as what?
10·The Harappan civilization's major city of Mohenjo-Daro was built on the banks of which river?
11·The 1957 film "The Bridge on the River Kwai" is set on a river now properly known by what Thai name?
12·The unique, isolated ecosystem of Lake Baikal in the Siberian Rift Valley is home to what endemic freshwater seal?
13·The Great Basin of the United States is hydrographically defined as the endorheic basin between the Rocky Mountains and which other range?
14·The "floating gardens" or chinampas of the Valley of Mexico were a key agricultural innovation of which civilization?
15·The catastrophic 1887 flood that dramatically altered the course of the Yellow River occurred during which Chinese dynasty?
16·Who was the climbing partner of Edmund Hillary on the first confirmed ascent of Mount Everest in 1953?
17·The name of the Volga River, Europe's longest, is thought to derive from a Proto-Slavic term meaning what?
18·Thomas Cole's famous 1836 painting "The Oxbow" depicts a distinctive bend in which American river?
19·Annapurna was the first 8,000-meter peak to be successfully climbed, an achievement by a 1950 expedition from which country?
20·The starchy root vegetable taro, a staple food in many tropical regions, is believed to have been first domesticated in the wetlands of which island?
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