My children ask questions ALL the time, which I love, but I don’t aways know the answer or if I do sometimes it’s hard to explain properly to a smaller person. I’ve pulled together a list of the most common science questions kids ask so you know where to come next time you’re a bit stuck for an explanation!

Ever wondered why dogs lick, why the sky is blue or what climate change is? Find out the answer to these and more science science kids ask #scienceforkids #kidssciencequestions

Science Questions for Kids

Questions about Earth and the Environment

What does climate change mean?

Discover what we mean by climate change and find some activities to help learn about it!

infographic explaining climate change and global warming to kids

Why is the sky blue?

Find out why the sky is blue, and how to make a rainbow!

Animal Questions

Why do dogs lick?

Dogs lick people for many reasons, it can be a sign of affection, attention or enjoyment. They might even just like the taste of whatever they’re licking off!

Chemistry Questions

Why do baking soda and vinegar fizz?

I’ve got many, many ways to demonstrate the baking soda and vinegar reaction. It’s a great first chemical reaction to learn about and what we call an acid-base reaction! The vinegar is the acid and the baking soda is the base ( alkali ).

Human Body Questions

What is a scab?

Find out why you get a scab, what they’re made from and even how to make one!

what is a scab - image of a jelly scab to find out. Example of a science question kids ask

Are mass and weight the same?

The answer is NO! If you were on the Moon your mass would be the same as on Earth, but your weight would be different! Find out how to work out weight here.

Biology Science Questions for kids

What is photosynthesis

Learn about the process of photosynthesis with some easy investigations.

What is respiration?

Learn about respiration with our hands on experiments, some of these are delicious!

Space Science Questions for Kids

Which is the hottest planet?

Venus is the hottest planet in our Solar System. Venus has a thick atmosphere which traps heat from the Sun but doesn’t let it escape.

How long would it take to get to Mars?

It would take about 6 months to get to Mars and another 6 to get home. That’s a long time to spend in space!

What are craters?

Find out how craters form with this easy activity using flour and marbles.

What’s inside the Earth?

There are several different layers inside the Earth, on the surface is a thin, rocky crust, under that is the mantle and in the centre a core made from very, very hot liquid metal. As the Earth spins the iron acts like a magnet. This is why a compass needle points the way it does.

Find out what’s inside the Earth with this simple play dough model.

model of the Earth's layers made from play dough

Is Pluto a planet?

Pluto was once the ninth planet of out Solar System but was declassified in 2006 and reclassified as a Dwarf Planet. It is located in the Kuiper Belt which is a ring of icy bodies further out than Neptune. Other Dwarf Planets are Eris, Makemake and Haumea.

Pluto – is it a planet?

Is Mercury hot or cold?

Mercury is actually both hot and cold! Mercury rotates on its axis very slowly. It takes almost 57 Earth days to rotate. The side facing the Sun is vert, very hot and the side facing away from the sun is very, very cold!

What is a Moonquake?

A Moonquake is an earthquake on the Moon! There are also Marsquakes, Venusqaukes and Sunquakes!

Why do we have day and night?

The Earth spins once on its axis each day. When the Earth is facing the Sun it is daytime and when it spins away from the Sun it is night time. You can demonstrate why we have night and day with a plasticine ball on a stick.

How do astronauts sleep?

Astronauts sleep in sleeping bags attached to the wall of a spacecraft.

What is a Goldilocks Planet?

Just like baby bear’s porridge, a Goldilocks zone is where it’s not too hot or too cold for life. Earth is a Goldilocks planet.

What is a group of stars called?

A group of stars is called a star cluster! Some star clusters are made up of just a few starts and some have hundreds!

If you’ve got any more science questions for kids, leave me a comment and I’ll add to the list!

Collection of science questions and answers for kids!  Find out why the sky is blue, why dogs lick, how astronauts sleep and more science questions

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Originally posted at Science Sparks