Riddles for Science Class with Answers

I have a nucleus but no lungs; I build bodies yet stay unseen. What am I?

I'm the gas plants breathe in and people breathe out. I help bubble in soda too. What am I?

I am the closest star that gives Earth daylight. What am I?

I am a rock created by volcanoes, cooling into crystals. What am I?

I pull oceans and apples alike. What am I?

I'm the invisible shield blocking harmful rays. What am I?

I'm the charged particle buzzing along circuits to light up rooms. What am I?

I'm the change of state from liquid to gas, lifting puddles into clouds. What am I?

I'm DNA's blueprint copy: same letters, different jobs. What am I?

I'm the simple machine that lifts with less force, see-saw in action. What am I?

I'm a star's life after it explodes, dense, tiny, with strong gravity. What am I?

I wear a suit made of protons and neutrons. Electrons orbit me. What am I?

I'm a chemical reaction that releases heat, like logs in a fireplace. What am I?

I'm the tool that helps scientists compare a variable against one that stays the same. What am I?

I'm the study of weather patterns swirling above, predicting tomorrow's forecast. What am I?

I am the layer of gases surrounding Earth. What am I?

I am the tool scientists use to see tiny cells. What am I?

I am the scale from 0 to 14 measuring acidity. What am I?

I am the fossil preserved in rock for millions of years. What am I?

I am the planet known as the Red Planet. What am I?

I am the green pigment in plants that captures sunlight. What am I?

I am the gas humans breathe in that plants release. What am I?

I am the process plants use to make food from sunlight. What am I?

I am the organ that pumps blood through your body. What am I?

I am H₂O, essential for all living things. What am I?

I am the table listing every element by symbol. What am I?

I am the state change when water turns to ice. What am I?

I am the joint that lets your arm bend. What am I?

I am the food chain level where plants make their own food. What am I?

I am the safety goggles you wear before any lab experiment. What am I?