Displaying questions 1 - 10 of 53
1.
The chemical symbol for water is?
2.
Which planet is known as the Red Planet?
3.
The process by which plants make their food is called?
4.
Which gas do humans need to breathe?
5.
What is the center of an atom called?
6.
The boiling point of water at sea level is?
7.
Which organ pumps blood throughout the human body?
8.
What force keeps us on the ground?
9.
Light travels fastest in?
10.
Which vitamin is produced when skin is exposed to sunlight?