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

Which scale measures the hardness of minerals, with diamond being the hardest at 10?

Which part of the nervous system is called the automatic system and controls involuntary body functions like digestion?

Which common household item works based on the principle of Pascal's law?

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

Which gas is released when metals like zinc react with dilute hydrochloric acid?

Which type of radiation has the greatest penetrating power among alpha beta and gamma radiation?

Which everyday observation shows that hot air rises and cool air sinks creating circulation?

Which everyday process explains how noise-cancelling headphones work?

Which process allows a submarine to sink or rise by adjusting water in ballast tanks?

Which planet in the solar system rotates on its side with an axial tilt of about 98 degrees?