80 Smart Science Riddles For Kids & Adults
These fun science riddles will tickle your brain, spark curiosity, and help kids and adults alike learn in a clever way. Great for classrooms, science clubs, or casual fun!
Physics Riddles
- I can go up and down but never move. What am I?
Answer: Temperature
- I fall but never rise. What am I?
Answer: Rain
- The faster you go, the more I push against you. What am I?
Answer: Air resistance
- I have energy but no mass. What am I?
Answer: Light
- I’m not alive, but I grow. I don’t breathe, but I blow. What am I?
Answer: Crystal
- I make things float or sink. What am I?
Answer: Buoyancy
- I’m invisible, yet I hold things down. What am I?
Answer: Gravity
- I’m measured in Newtons. What am I?
Answer: Force
- I can vibrate, echo, and bounce. What am I?
Answer: Sound
- The more I vibrate, the higher I sound. What am I?
Answer: Frequency
- I’m created when energy changes forms. What am I?
Answer: Heat
- I flow through wires and light your world. What am I?
Answer: Electricity
- I move fast in a vacuum and slow in water. What am I?
Answer: Light
- I go through walls but bounce off metal. What am I?
Answer: Magnetic field
- I measure motion, not distance. What am I?
Answer: Speed
- I resist change, especially in motion. What am I?
Answer: Inertia
- I’m the reason you feel heavy or light. What am I?
Answer: Gravity
- I reflect, absorb, or pass through. What am I?
Answer: Light
- Without me, you’d float into space. What am I?
Answer: Gravity
- I expand when heated and contract when cooled. What am I?
Answer: Matter
Chemistry Riddles
- I bubble and fizz when mixed. What am I?
Answer: Chemical reaction
- I’m the smallest part of a compound. What am I?
Answer: Molecule
- I change colors but I’m not magic. What am I?
Answer: Indicator
- I’m used to test acids and bases. What am I?
Answer: Litmus paper
- I’m solid, liquid, and gas. What am I?
Answer: Matter
- I can bond, break, or explode. What am I?
Answer: Atom
- I’m salty but not food. What am I?
Answer: Sodium
- I freeze at 0°C and boil at 100°C. What am I?
Answer: Water
- I’m the gas you breathe out. What am I?
Answer: Carbon dioxide
- I’m used to clean, but I’m a compound. What am I?
Answer: Soap
- I rust metal but help plants. What am I?
Answer: Oxygen
- I’m slippery, sour, or bitter. What am I?
Answer: Chemical
- I explode with vinegar. What am I?
Answer: Baking soda
- I’m not alive, but I react. What am I?
Answer: Chemical substance
- I have protons, neutrons, and electrons. What am I?
Answer: Atom
- I change forms but never disappear. What am I?
Answer: Matter
- I’m found on the periodic table and love bonding. What am I?
Answer: Element
- I give off heat when I react. What am I?
Answer: Exothermic reaction
- I hide inside water, but I’m a gas. What am I?
Answer: Hydrogen
- I cause things to burn. What am I?
Answer: Oxygen
Biology Riddles
- I’m in your blood but not your bones. What am I?
Answer: Plasma
- I help you breathe but I’m not your nose. What am I?
Answer: Lungs
- I carry oxygen around your body. What am I?
Answer: Red blood cells
- I digest but I’m not hungry. What am I?
Answer: Stomach
- I connect bones together. What am I?
Answer: Ligament
- I pump and never stop. What am I?
Answer: Heart
- I make food for plants. What am I?
Answer: Chloroplast
- I absorb water from the ground. What am I?
Answer: Roots
- I’m the brain of a plant cell. What am I?
Answer: Nucleus
- I keep cells in shape. What am I?
Answer: Cell wall
- I’m the powerhouse of the cell. What am I?
Answer: Mitochondria
- I protect your body from germs. What am I?
Answer: Immune system
- I grow hair and nails. What am I?
Answer: Skin
- I’m green and love sunlight. What am I?
Answer: Leaf
- I stretch, flex, and help you move. What am I?
Answer: Muscle
- I’m made of cells but I’m not a jail. What am I?
Answer: Tissue
- I beat faster when you run. What am I?
Answer: Heart
- I see but have no eyes. What am I?
Answer: Microscope
- I carry messages in your body. What am I?
Answer: Nerves
- I’m part of DNA and shape who you are. What am I?
Answer: Genes
General Science Riddles
- I orbit the Sun and reflect light. What am I?
Answer: Planet
- I’m hot, bright, and center of the system. What am I?
Answer: Sun
- I shine at night but don’t make my own light. What am I?
Answer: Moon
- I’m full of stars and galaxies. What am I?
Answer: Universe
- I bring thunder, lightning, and rain. What am I?
Answer: Storm
- I fall from the sky and make things wet. What am I?
Answer: Rain
- I freeze everything and form snow. What am I?
Answer: Cold
- I warm the Earth but can burn your skin. What am I?
Answer: Sunlight
- I happen when tectonic plates move. What am I?
Answer: Earthquake
- I cause volcanoes to erupt. What am I?
Answer: Magma
- I go up as heat increases. What am I?
Answer: Thermometer
- I circle Earth and help forecast weather. What am I?
Answer: Satellite
- I orbit Earth and affect tides. What am I?
Answer: Moon
- I measure distance in space. What am I?
Answer: Light-year
- I am both a solid and a crystal. What am I?
Answer: Ice
- I store energy and make devices work. What am I?
Answer: Battery
- I measure mass, not weight. What am I?
Answer: Balance scale
- I’m a tool with lenses that makes things closer. What am I?
Answer: Telescope
- I help you zoom into tiny life. What am I?
Answer: Microscope
- I record temperature and help forecast. What am I?
Answer: Thermometer