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Question 1 of 15

What is the hardest natural substance on Earth?

Question 2 of 15

How many continents are there?

Question 3 of 15

Which element has the chemical symbol “O”?

Question 4 of 15

What is the main ingredient in guacamole?

Question 5 of 15

Which fruit has its seeds on the outside?

Question 6 of 15

Which animal is known as the King of the Jungle?

Question 7 of 15

Which part of the plant conducts photosynthesis?

Question 8 of 15

What is the boiling point of water in Celsius?

Question 9 of 15

Which month has an extra day in a leap year?

Question 10 of 15

What is the square root of 81?

Question 11 of 15

How many legs does a spider have?

Question 12 of 15

Which U.S. holiday is celebrated on the fourth Thursday in November?

Question 13 of 15

Who painted the ceiling of the Sistine Chapel?

Question 14 of 15

Which bird is known for its impressive memory and tool use?

Question 15 of 15

How many stars are on the flag of the European Union?