Which planet is known as the Red Planet?

What is the process by which plants make their food using sunlight?

What is the boiling point of water at sea level?

Which gas is most abundant in the Earth's atmosphere?

What is the force that pulls objects toward the center of the Earth?

What is the basic unit of life?

Which organ in the human body is primarily responsible for pumping blood?

What is the largest planet in our solar system?

What is the chemical symbol for gold?

What is the main gas found in the air we breathe?

What is the hardest natural substance on Earth?

What is the center of an atom called?

What is the process by which a liquid changes into a gas?

What is the primary source of energy for the Earth?