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Curious Kids: why is the sea salty?

The salt in the sea has built up over billions of years – but it wouldn't have got there without freshwater rivers and streams.
When you have a wound, your body gets to work straight away to clean it out, kill germs and repair the skin. Shutterstock/Yakobchuk Viacheslav

Curious Kids: how do wounds heal?

The body tries to plug a wound quickly to stop germs getting in through broken skin and making you sick. But behind the scenes, your blood is working hard to repair a wound.
The air up high is just really bad at ‘holding’ onto the radiation coming from the Sun, and the warmth passes straight through it on its journey toward the ground. Kevin Spencer/flicr

Curious Kids: why is air colder the higher up you go?

It helps if you imagine the ground here on Earth as a big heater. It keeps us warm, and if you move away from the heater you feel cold.

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