Science Riddles with Answers

I have a nucleus but never carry a phone. I build your body while remaining unseen. What am I?

I’m round and bright and control the tides. I disappear each morning when the daylight rides. What am I?

I’m the gas plants breathe in and people breathe out. In fire, I scream without a shout. What am I?

I’m a rock that once burned bright. Lava made me, pressure shaped me. What am I?

I’m the star at the center of the show, giving heat and light wherever I go. What am I?

I’m a force that pulls yet I’m never seen. I keep your feet planted and planets in a ring. What am I?

I’m the speed limit of the universe, a traveler of space. No ship outruns me in any race. What am I?

I’m a change of state from liquid to gas, leaving cups empty as hours pass. What am I?

I run on tracks but have no wheels. Electrons power my spins and feels. What am I?

I’m the building block of proteins and make hair grow. Twenty of us mix to put on the show. What am I?

I’m the organ that never rests, pumping life from east to west. What am I?

I’m an icy rock with a fiery tail. Make a wish before I sail. What am I?

I’m the scientist’s helper in every experiment, showing what happens when you change only one thing. What am I?

I’m the layer of air that keeps Earth warm, a blanket you barely feel. What am I?

I’m the particle with a negative charge, orbiting the nucleus near and far. What am I?