1) What is H₂O commonly known as? a) a) Oxygen b) b) Water c) c) Hydrogen d) d) Carbon dioxide 2) What is the hardest natural substance on Earth? a) a) Iron b) b) Gold c) c) Diamond d) d) Silver 3) Who discovered gravity? a) a) Albert Einstein b) b) Isaac Newton c) c) Galileo Galilei d) d) Thomas Edison 4) What is the largest bone in the human body? a) a) Skull b) b) Femur c) c) Spine d) d) Rib 5) Which type of energy is stored in food? a) a) Mechanical energy b) b) Chemical energy c) c) Thermal energy d) d) Light energy 6) Which planet has the most moons? a) a) Mars b) b) Jupiter c) c) Saturn d) d) Neptune 7) Which of these planets has the shortest day? a) a) Earth b) b) Jupiter c) c) Mars d) d) Venus 8) What is the largest organ in the human body? a) a) Brain b) b) Heart c) c) Skin d) d) Liver 9) What is the process of changing a liquid to a gas? a) a) Freezing b) b) Condensation c) c) Evaporation  d) d) Melting 10) Which of these is the main source of energy for the Earth? a) a) The Moon b) b) The Sun c) c) The Wind d) d) The Ocean

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