Science quiz: How much do you know about atoms, planets and beyond?

Questions

1. What planet is known as the Red Planet?
2. What is the chemical symbol for water?
3. How many states of matter are commonly recognized?
4. What is the process by which plants take in carbon dioxide and release oxygen?
5. Who developed the theory of gravity?
6. What is the largest organ in the human body?
7. What gas do humans breathe in?
8. Which part of the cell contains genetic material?
9. What is the main source of energy for the Earth?
10. The speed of light is approximately how many miles per second?

Answers

1. Mars
2. H₂O
3. Four (solid, liquid, gas, plasma)
4. Photosynthesis
5. Isaac Newton
6. Skin
7. Oxygen
8. Nucleus
9. The Sun
10. 186,282 miles per second