Which scientist proposed the theory of relativity?

Which property of sound determines how high or low it is perceived by the human ear?

Which layer of the atmosphere contains the ozone layer that absorbs harmful ultraviolet radiation?

Which planet is known as the Blue Planet due to its large amount of surface water?

Which scientist is credited with developing the theory of evolution by natural selection?

Which chemical element has the highest melting point of all pure metals, used in light bulb filaments?

Which gas makes up approximately 0.04 percent of Earth's atmosphere and is essential for plant photosynthesis?

Which vitamin deficiency commonly causes night blindness in humans?

What is the freezing point of water in Celsius?

Which flap of tissue prevents food from entering the trachea during swallowing?

Which atmospheric phenomenon causes the sky to appear blue during the day?