1. Six
   Five
2. Eight
   Seven

Australia is the smallest continent on the planet and Asia is the largest. Asia and Europe are the only continents that aren't completely surrounded by water. When combined, Eurasia is the largest continent on the planet.

1. Spheroid
   Sphere
2. Flat
   Square

The world is an oblate spheroid, which means it's not a pure sphere. It resembles a squished sphere and is wider at the center where the equator lies. The globe spins like a basketball on a fingertip, so it spins fastest at the equator and barely spins at the poles.

1. India
   Brazil
2. Russia
   Canada

Russia covers more than 6.6 million square miles of land. Canada, China, the United States and Brazil round out the top five largest countries in terms of area, and Russia is about double the size of Brazil. Russia's population hovers around 145 million people.

1. Elephant
   Blue whale
2. Giraffe
   Great white shark

Blue whales can grow up to 100 feet long and weigh more than 150 tons. That's more than 15 times heavier than a Tyrannosaurus Rex and about 25 times heavier than a woolly mammoth. Blue whales can live close to 100 years in the wild.

1. Rome
   Cairo
2. Paris
   Athens

Paris is one of the most visited cities in the world due to its plethora of world-renowned landmarks. The Eiffel Tower was built by Gustave Eiffel for the 1889 World's Fair. Today it's an international icon of France and attracts millions of visitors per year.

1. 8.5 billion
   7.8 billion
2. 5.4 billion
   9.1 billion

The most populous country in the world is China with around 1.4 billion citizens. That accounts for almost 20% of the world's population. India is home to another 1.4 billion citizens. Vatican City is the world's least populous country with fewer than 1,000 citizens.

1. Inner core
   Mantle
2. Crust
   Outer core

The Earth's crust extends more than 40 miles deep, but it's only a few miles deep at its thinnest spots, which is usually the ocean floor. The thinnest parts of the crust are made of dense iron, making it just as difficult as drilling through 40 miles of rock and mud.

1. The Andes
   The Himalayas
2. The Alps
   The Rockies

The Himalayas run for about 1,500 miles in Asia. They mostly sit along the border of Nepal, India and China, but they also touch other countries in the area, like Bhutan, Afghanistan and Pakistan. South America's Andes is the longest mountain range in the world, running for more than 4,300 miles.

1. The Arctic
   Antarctica
2. Argentina
   Australia

Polar bears live in the Arctic, and they don't live in Antarctica. They're known for their white fur, but they actually have black skin. Like most animals in the area, the black skin is essential for absorbing and conserving heat from the sun amid the Arctic's freezing temperatures.

1. Greece
   Italy
2. France
   Egypt

The Great Pyramid of Giza and the Great Sphinx sit just outside of Cairo. The Great Pyramid dates back to 2580 BC and stands more than 450 feet tall. Hundreds of thousands of people spent years building the pyramids.

1. Two
   Three
2. Four
   Five

The five oceans are: Pacific, Atlantic, Indian, Arctic and the Southern or Antarctic Ocean. All of the oceans are connected, so there is technically one ocean on Earth, but the five sections of the ocean feature wildly different ecosystems and animal life.

1. Equator
   Tropic of Cancer
2. Tropic of Capricorn
   Prime meridian

The world is filled with imaginary lines, and the equator is one of the most famous of them all. Countries on the equator experience equal amounts of sunlight and darkness each day. The equator passes through about a dozen countries.

1. Arctic Ocean
   Pacific Ocean
2. Atlantic Ocean
   Indian Ocean

The Pacific Ocean is home to the Mariana Trench, which is the world's deepest trench. Within the trench is the Challenger Deep, which is a valley that reaches 36,000 feet deep and is Earth's deepest point.

1. The Arctic
   Siberia
2. Antarctica
   Greenland

Polar bears and penguins don't live together. The Galapagos penguin lives near the equator and is the only penguin found north of the equator. All other penguins live south of the equator and millions live in Antarctica. More than a million penguins live on Danger Island near Antarctica.

1. Northern hemisphere
2. Southern hemisphere

The Tropic of Capricorn is one of many lines that divide the globe and barely anyone lives south of it. It marks the southernmost circle of latitude where the sun appears directly overhead. The line sits about 23 degrees south of the equator.

1. 28 days
   7 days
2. 24 hours
   365 days

It actually takes 365.25 days for the Earth to orbit the Sun. Every four years, we add an extra day to the calendar to make up for the additional time needed to orbit the Sun. The planet travels at 67,000 miles per hour while orbiting the sun.

1. Singapore
   Hong Kong
2. Vatican City
   Macau

Vatican City is both the least populous and smallest country in the world. Fewer than 1,000 people call Vatican City home, and the country doesn't have a commercial housing market. It's the official residence of the pope and is filled with some of the world's most famous landmarks.

1. Asia
   Africa
2. North America
   South America

Asia is both the largest and most populous continents on the globe. About 30% of the world's population lives in China and India, and about 60% of the world's population lives in Asia. More than 4.6 billion of the world's 7.8 billion people live in Asia.

1. North America
   Africa
2. Australia
   South America

Kangaroos are native to Australia and are barely found elsewhere in the world. Some kangaroos may exist in surrounding areas, like Papua New Guinea and New Zealand, but you won't find them anywhere else in the wild.

1. Vertically
2. Horizontally

The equator splits the globe in half horizontally and the prime meridian splits it in half vertically. It sits at 0-degrees longitude and starts and ends at the arctic poles. Unlike the equator, the prime meridian isn't a fixed line and has changed dozens of time.

1. 365 days
   Seven days
2. 24 hours
   27 days

The world is spinning at 1,000 miles per hour at its fastest points, which are along the equator. It takes just less than 24 hours for the planet to complete one full rotation on its axis. The world spins like a basketball on a fingertip.

1. English
   Chinese
2. Spanish
   Russian

There are more than 1.1 billion Mandarin speakers on the globe, but a majority of them live in China. There are nearly 1 billion English speakers in the world, and it's the globe's most widely spoken language.

1. Africa
   South America
2. Asia
   North America

The Nile River runs for 4,132 miles and the Amazon River runs for 3,977 miles, but some officials claim the Amazon River is actually the world's longest river. It mostly winds through northern Brazil, but its tributaries flow through Peru, Bolivia, Ecuador, Colombia and Venezuela.

1. Australia
   Africa
2. Europe
   South America

Giraffes are one of the most unique animals on the planet. The first people to discover them believed they were a cross between camels and jaguars. The okapi is the only other member of the Giraffidae family. Both animals live in Africa and aren't found elsewhere in the wild.

1. The Arctic
2. Antarctica

Antarctica is a continent, but the Arctic isn't a continent. If you ever see someone walking on "land" in the Arctic, they're walking on a sheet of ice covering the Arctic Ocean. The North Pole is located in the middle of the Arctic Ocean.

1. 4.5 billion years old
   1 million years old
2. 100 billion years old
   1 billion years old

The age of the Earth is nothing more than an estimate, but it's a pretty educated estimate. Some elements, like certain types of uranium, have a half-life of billions of years. The radioactivity of these elements can be used to date the planet.

1. Islam
   Hinduism
2. Christianity
   Nonreligious

There are more than 4,200 religions across the globe and about 30% of the world's population is Christian. More than 2.4 billion people follow a Christian denomination. Islam counts about 2 billion members, and more than 1 billion people identify as agnostic or atheist.

1. Lake Michigan
   Lake Superior
2. Lake Victoria
   Lake Huron

Lake Superior is the largest freshwater lake in the world in terms of surface area. Lake Baikal in Russia is the world's largest freshwater lake in terms of volume. Lake Baikal is also the deepest lake in the world.

1. Europe
   Australia
2. Africa
   South America

The green anaconda is known as the largest snake in the world. It can measure nearly 30 feet long and weigh more than 500 pounds. They are great swimmers and thrive in the swampy areas near the Amazon jungle in South America.

1. Asia
   Africa
2. South America
   Europe

The Alps run for 750 miles across several countries in Europe. France, Switzerland and Italy are three of the most popular homes to the Alps, but the mountains also run across Austria, Monaco, Germany, Liechtenstein and Slovenia. France's Mont Blanc is the tallest peak in the Alps.

1. 27 days
   7 days
2. 365 days
   24 hours

It takes either 27 or 29 days for the moon to orbit the Earth, depending on how it's calculated. This is because the moon's orbit of the Earth isn't a perfect circle, and the position of the sun is constantly changing.

1. Greek god
   Roman goddess
2. The ground
   Egyptian deity

All planets in our solar system are named after Greek or Roman gods and goddesses, except for the Earth, which is named after the ground. The word stemmed from the German and Old English words, "erde" and "eorthe."

1. Indonesia
   Greenland
2. Australia
   Iceland

There are a countless number of islands in the world, but Greenland is the biggest of them all. The island covers more than 836,300 square miles of land but is only home to 50,000 people. The island of Java covers just 49,536 square and is home to more than 141 million people.

1. China
   Russia
2. Brazil
   Australia

Panda bears are only known to live in central China. There are only a couple of thousand pandas left in the wild, but numbers have steadily been increasing over the past 50 years. You can see pandas at zoos in many countries around the world.

1. First
   Second
2. Third
   Fourth

Earth is the "third rock from the sun." We are more than 91.6 million miles away from the sun. It takes about eight minutes for light to travel from the sun to the Earth. When you look at the sun, you're seeing what the Sun looked like eight minutes ago.