Well, hello and welcome to a brand new episode of the Fun Kids Science Midweekly. It's a brand new

episode of your brand new podcast. It's your quick, bite-sized science special on a Wednesday.

My name is Dan. It's just a little update. Let's check in what's happening around the solar system. This week, we'll find out all about why different types of stones exist. Plus, we'll discover a story about ear defenders and we'll uncover mysteries behind breathing. So let's get into it.

Ralph, who is nine years old, kicks us off. Why are there

different types of stones? Well, there are three different types of stones, Ralph. You have

sedimentary, you've got metamorphic, and you've got igneous. I think igneous is my favourite.

I'll let you know why in just a sec.

Because they're all different really, because of how they've been made and how they've formed over time.

Sedimentary rocks come from glaciers, rivers, oceans, plants. You might recognize the word sediment, which is like little drops of dirt that's been

left over for ages. Maybe your mum and dad might mention it when they're talking about planting

and when they're talking about cooking. You might get the sediment at the bottom. It's kind of like

that. When you've got glaciers, rivers, oceans and plants, they're buried over millions of years and the pressure and heat all around them bonds all of that stuff.

Everything that's been left over. All those dead decomposing plants, it bonds them into rocks, sedimentary rocks.

Also, there's metamorphic rock, which is made of one type of stone, and it's when it changes to another. When there's a massive force from above, it will change what type of rock it is. It might change colour or texture. It will completely shifts. That's metamorphic, Ralph. Also, you've got igneous rock. Ignis comes from the Latin word

for fire. Can you guess how igneous rock is made? They're made from where boiling hot molten rock

under the ground crystallizes, it solidifies, and that's how you get igneous rock. Ralph, those are the

different types of stones and rocks.

Thank you for the question. Here's one from amazingly named Disappointed of Ed.

You can call yourself anything. I love that. A disappointed of Ed asks, when you put ear defenders on,

why can you hear yourself better? Well, it's the same as anything.

If you cover your ears right now with your hands, if you cup them over, you're blocking out every other noise.

It's just you and your voice. It's been isolated. So you can't hear everything else.

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