Analysis and Comment

Do you think you could make an echo at Echo Point in Katoomba? Flickr/Amanda Slater

Curious Kids: what makes an echo?

When a sound is made, it spreads. And when it hits a hard surface that is far away, it bounces back and comes back to where the sound was made. That's what we call an echo.

Curious Kids: how do shells get made?

Molluscs that have shells - like pipis, clams and oysters - have to build their own shell from scratch. And they keep building it their whole life, using chemicals from the sea and their own bodies.

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Curious Kids

Curious Kids: why do we have a drought?

We can't make it rain. But you are already helping if you don't use more water than you need. And you can talk to your parents about the planet getting warmer, because the heat makes drought worse.

Curious Kids: why are burps so loud?

As gas from your stomach comes up your food pipe, it makes the surface of the upper part of your oesophagus rattle and vibrate. It is a bit like windows that rattle during a windy storm.

Curious Kids: how is water made?

While making small volumes of pure water in a lab is possible, it’s not practical. The reaction is expensive, releases lots of energy, and can cause really massive explosions.

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