This four-letter word describes the center layer of Earth.
What is the core?
This is the most populous city in the United States.
What is New York City?
This is the largest planet in the Solar System.
What is Jupiter?
The famous "I Have a Dream" speech was delivered to over 250,000 people in 1963 by this man.
Who is Martin Luther King Jr.?
This letter is the Roman numeral for 50.
What is L?
This is the hardest mineral on Earth.
What is diamond?
This language is the most widely spoken one on Earth.
What is Mandarin Chinese?
This theory describes how our universe might have began.
What is the Big Bang theory?
This artist painted the Mona Lisa.
Who is Leonardo da Vinci?
This is the most commonly used letter in the English language.
What is E?
This term describes all of the living organisms in a specific area.
What is an ecosystem?
This is the capital city of Japan.
What is Tokyo?
This planet is the hottest in the Solar System.
What is Venus?
This city was the first capital of the United States.
What is Philadelphia?
Someone can celebrate their "centennial" birthday when they are this number of years old.
What is 100?
This is the process by which Earth's materials are broken down.
What is erosion?
This is the smallest country in the world.
What is Vatican City?
This is the number of signs there are in the Zodiac.
What is 12?
Women in the United States did not have the right to vote until this year.
A male duck is called this.
What is a drake?
Between the Earth's crust and core is this layer.
What is the mantle?
This is the world's biggest island.
What is Greenland?
Mars is named after the mythological Roman god of this.
What is war?
This Roman leader was famously assassinated on March 15th, 44 BC.
Who is Julius Caesar?
"Cynophobia" is the overwhelming fear of this animal.
What is a dog?