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Science Riddles With Answers

From planets to magnets, these science riddles turn facts into playful mysteries for students, families, teachers and lifelong learners.

52 riddles with answers Surprise me

Make them useful

Best ways to use science riddles

Lesson hooks

Open a topic with a mystery that makes pupils retrieve facts before new teaching begins.

STEM clubs

Use the clues as team rounds, then ask each team to explain the science behind the answer.

Curious family quizzes

Mix easier observation clues with harder concept riddles so different ages can contribute.

Age guidance

Observation-based science riddles can work from age 7. Clues involving technical vocabulary or abstract forces are usually better for ages 10 and up, teens and adults.

Read, guess, reveal

Science riddles

I follow you in daylight but disappear in the dark. What am I?

Reveal answer

The answer is

Your shadow

Hints and details

What is full of holes but still holds water?

Reveal answer

The answer is

A sponge

Hints and details

I begin life in water, then grow legs and croak. What am I?

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The answer is

A frog

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I start small and quiet, then burst into a fluffy snack. What am I?

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The answer is

Popcorn

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I have many eyes but cannot see. I grow underground. What am I?

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The answer is

A potato

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I paint the sky with many colors but never use a brush. What am I?

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The answer is

A rainbow

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My rings tell my age, but I never wear jewelry. What am I?

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The answer is

A tree

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I seem to change shape through the month, but I stay round. What am I?

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The answer is

The moon

Hints and details

I am a tiny winter star that melts in your hand. What am I?

Reveal answer

The answer is

A snowflake

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I look like a mountain, but sometimes I roar and spill glowing rock. What am I?

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The answer is

A volcano

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You cannot see me, but you can feel me push your kite. What am I?

Reveal answer

The answer is

The wind

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We appear when the sun goes away, but we are not light switches. What are we?

Reveal answer

The answer is

Stars

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

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The answer is

Mars

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I can pull metal toward me, but I have no hands. What am I?

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The answer is

A magnet

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I can be a solid, liquid or gas, but I am always the same thing. What am I?

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The answer is

Water

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I travel faster than anything else and help your eyes see. What am I?

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The answer is

Light

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I am in the air, invisible, and your body needs me every moment. What am I?

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The answer is

Oxygen

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I fly at night and sometimes sleep upside down. What am I?

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The answer is

A bat

Hints and details

What book writes about you without holding a pen?

Type:What Am I?ScienceTechnology
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The answer is

A diary app or activity log.

Hints and details

What lamp makes a room darker when you turn it on?

Type:What Am I?ScienceTechnology
Reveal answer

The answer is

A lamp in a photo editing app using a dark filter.

Hints and details

What wall can you scroll but never climb?

Type:What Am I?ScienceTechnology
Reveal answer

The answer is

A social media wall or feed.

Hints and details

What fish lives in a browser and catches your attention?

Type:WordplayScienceTechnology
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The answer is

Clickbait.

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What key can lock you out if you forget it?

Type:What Am I?ScienceTechnology
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The answer is

A password.

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What window can show yesterday but never lets in air?

Type:What Am I?ScienceTechnology
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The answer is

A photo gallery window on a screen.

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What picture gets louder the more people look at it?

Type:JokeScienceTechnology
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The answer is

A meme.

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What bird can sit on your screen all day and never fly away?

Type:What Am I?ScienceTechnology
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The answer is

A cursor shaped like a bird.

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What home can fit on a key but has no rooms?

Type:What Am I?ScienceTechnology
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The answer is

The word Home on a keyboard key.

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What sound can you see but not hear?

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The answer is

A sound wave on a screen.

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What window opens a world but is not made of glass?

Type:What Am I?ScienceTechnology
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The answer is

A browser window.

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What button makes things stop instead of start?

Type:What Am I?ScienceTechnology
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The answer is

A pause button.

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What page turns itself without hands?

Type:What Am I?ScienceTechnology
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The answer is

A webpage that auto-refreshes.

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What bell can wake you up but has no metal?

Type:What Am I?ScienceTechnology
Reveal answer

The answer is

A phone alarm.

Hints and details

What letter can travel around the world without an envelope?

Type:What Am I?ScienceTechnology
Reveal answer

The answer is

The letter in an email.

Hints and details

I light up the night but I do not need a plug. What am I?

Reveal answer

The answer is

The moon

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I am made of gas, wrapped in liquid, and I pop when I get too bold. What am I?

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The answer is

A bubble

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I sing at night, jump in the grass, and rub my legs to make music. What am I?

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The answer is

A cricket

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I follow you in sunlight, vanish in darkness, and copy your shape without touching you. What am I?

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The answer is

A shadow

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I can pull some metals closer, but I never use my hands. What am I?

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The answer is

A magnet

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You can feel me, hear me, and see what I move, but you cannot hold me. What am I?

Reveal answer

The answer is

Wind

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I tell time by copying the sun's refusal to stand still; indoors I am useless, and at noon I almost disappear. What am I?

Type:LogicScienceTime
Reveal answer

The answer is

A sundial's shadow

Hints and details

Scientists trust me only after trying to prove me wrong; assume me without testing and I am just a guess. What am I?

Reveal answer

The answer is

A hypothesis

Hints and details

I find cracks before publication, improve an argument by pressing its weak points, and work best when the attack is fair. What am I?

Reveal answer

The answer is

Peer review

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If A=1, B=2, C=3, what is CAT worth?

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The answer is

24

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If A=1, B=2, C=3, what is DOG worth?

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The answer is

26

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If A=1, B=2, C=3, what is BRAIN worth?

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The answer is

44

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If A=1, B=2, C=3, what is RIDDLE worth?

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The answer is

52

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If A=1, B=2, C=3, what is PLAY worth?

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The answer is

54

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What letter is 5 places after M?

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The answer is

R

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What letter is 4 places before T?

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The answer is

P

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What comes next: A, D, G, J, ?

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The answer is

M

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What comes next: Z, W, T, Q, ?

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The answer is

N

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What comes next: AZ, BY, CX, DW, ?

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The answer is

EV

Hints and details

A simple group format

How to play

  1. 1Choose riddles that match topics the group has encountered rather than testing unknown facts.
  2. 2Give one point for the answer and a bonus point for a clear scientific explanation.
  3. 3After the reveal, invite players to rewrite one clue using a new fact about the answer.

Helpful answers

Science riddle FAQ

No. Many clues use everyday observations, and some include an extra hint. More technical riddles can be chosen for older or experienced groups.

They practise recall, inference and explanation. Asking why an answer fits is more valuable than simply guessing it.

No. Solvers can try the clue first, choose whether to use the hint, and reveal the answer when they are ready.

Turn these riddles into a game

Earn points, build a streak and see how many clues you can solve without using a hint.

Play now