[Answer] What is the only major river to cross the equator twice?

Step 1 : Introduction to the question "What is the only major river to cross the equator twice?"

...The Congo River traverses the latitudinal line twice, making it the only major river to do so. It travels approximately 2,920 miles from its water source of the Chambeshi River in Zambia, through the Congo rainforest, and into the Atlantic Ocean. It is the second-longest river in Africa, after the Nile.

[Answer] In what country does the Amazon River begin?

Step 1 : Introduction to the question "In what country does the Amazon River begin?"

...The precise origin of the Amazon River is a matter of some debate. No fewer than five tributaries have been named as the river’s source over the centuries, and all are located in southwestern Peru. The Amazon River also flows through five other countries — Bolivia, Brazil, Colombia, Ecuador, and Venezuela — before emptying into the Atlantic.

[Answer] Lewis and Clark reached the Pacific Ocean by what river?

Step 1 : Introduction to the question "Lewis and Clark reached the Pacific Ocean by what river?"

...The epic journey west by Meriwether Lewis and William Clark in the early 19th century is bookended by two important rivers. The first was the Missouri River, which provided passage for the two explorers and their expedition party all the way to its headwaters in Montana. After traveling the Lolo Pass, Lewis and Clark continued on the Clearwater River until reaching the Snake River in modern-day Idaho. From there, they traveled the Columbia River in Washington until they reached the Pacific Ocean.

[Answer] What is the longest river contained within a single country?

Step 1 : Introduction to the question "What is the longest river contained within a single country?"

...Both the Amazon and the Nile outstretch the Yangtze River, but the latter is the longest river to run entirely through one country, China. The 3,915-mile river is also the longest in Asia, traveling from the Tibetan Tanggula Mountains to the East China Sea. The Chinese name for the river is “Chang Jiang,” which aptly translates to “long river.”

[Answer] Africa’s Nile River was a vital source for what ancient civilization?

Step 1 : Introduction to the question "Africa’s Nile River was a vital source for what ancient civilization?"

...The Nile River flows for 4,160 miles, from east-central Africa to the Mediterranean Sea. The river helped develop ancient Egyptian society, providing fertile soil and water for irrigation and serving as a vehicle for transporting building materials. This led to advances in agriculture, boat-building, and other technologies.

[Answer] What river flows through the Grand Canyon?

Step 1 : Introduction to the question "What river flows through the Grand Canyon?"

...Along the Colorado River's 1,450-mile journey, travelers will find Lake Powell, Lake Mead, the Hoover Dam, and the Grand Canyon. The Colorado has carved the Grand Canyon for more than 5 million years, creating wondrous crags and cliffs with its constant flow. The river originates in Rocky Mountain National Park, and winds its way through 10 more national parks before it reaches its terminus just shy of the Gulf of California in Mexico.

[Answer] What is an antonym for “hillock”?

Step 1 : Introduction to the question "What is an antonym for “hillock”?"

...1. Corner 2. Straightaway 3. Mountain 4. Fjord