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Science Questions, Answered

Clear answers to everyday science questions, from light and sound to chemistry, weather and the Earth itself.

  1. Why is grass green?Science
  2. Why do stars twinkle?Science
  3. What causes the northern lights?Science
  4. What is a light-year?Science
  5. What is a black hole?Science
  6. What is the speed of sound?Science
  7. What is static electricity?Science
  8. How do magnets work?Science
  9. What is the largest organism on Earth?Science
  10. What causes earthquakes?Science
  11. How do volcanoes form?Science
  12. What causes tides?Science
  13. What causes the seasons?Science
  14. What is the difference between weather and climate?Science
  15. What is absolute zero?Science
  16. Why do objects fall at the same speed in a vacuum?Science
  17. What is gravity?Science
  18. What does E=mc2 mean?Science
  19. Who proposed the theory of relativity?Science
  20. Who discovered penicillin?Science
  21. What is DNA?Science
  22. What is photosynthesis?Science
  23. What is the most abundant element in the universe?Science
  24. What is the lightest element?Science
  25. How many elements are on the periodic table?Science
  26. What is the chemical formula for water?Science
  27. What is the chemical symbol for gold?Science
  28. What is the hardest natural substance?Science
  29. What is the freezing point of water?Science
  30. What is the boiling point of water?Science
  31. Why are sunsets red and orange?Science
  32. What is the most abundant gas in Earth's air?Science
  33. Why do leaves change color in autumn?Science
  34. Why is the ocean salty?Science
  35. What is the speed of light?Science
  36. Why do we see lightning before we hear thunder?Science
  37. What makes a rainbow?Science
  38. Why does ice float on water?Science