1.
How many colours are there in a rainbow?
2.
Which force keeps us on the ground?
3.
What is the hardest natural substance on Earth?
4.
What is the common name for frozen water?
5.
Which ocean is located between the Americas and Europe?
6.
In which country are the Great Pyramids of Giza located?
7.
Legally, are tomatoes fruits or vegetables?
8.
What is the currency used in Japan?
9.
What is a synonym for "Enormous"?
