If there were no trees, would there still be enough oxygen for us to breathe?

BreconBeacons43

Air is mostly made up of a gas called nitrogen. But about one-fifth of the air (21%) is oxygen – the gas our bodies use when we breathe.

All living things need oxygen in order to stay alive but plants, algae and a group of bacteria called cyanobacteria, can also make oxygen. These plants, algae and cyanobacteria make more oxygen than they use and the extra oxygen goes back into the air. So, the oxygen is sort-of recycled, rather than used up.

Plants like trees use their leaves to make oxygen. But what if there were no trees left on Earth – would there still be enough oxygen in the air for us to breathe?

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Is oil really made of dead dinosaurs?

dinosaurs

Oil is a type of fuel, which means that it is something we use to make energy. We burn oil to heat buildings and to make electricity, and we use it to make petrol and diesel for cars and other vehicles. There are also some rather surprising uses for oil, including chewing gum, lipstick and guitar strings!

But what is oil? How is it made? And does it really come from dead dinosaurs?

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Will it snow?

winter_trees

My daughter was hoping for a white Christmas but, given that we live in the warm, south-western corner of England, the chances of snow each winter are small and the likelihood of snow on Christmas Day is even lower. And even though we’ve had days when it’s been cold enough for ice to form on the car windscreen, I don’t think we’ve seen any snowfall for a year or two. So, what has to happen for it to snow?

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Why is there no air on the Moon?

I was asked two questions a few weeks ago and I’ve been pondering the answers ever since: Why is there no air on the Moon? And how does our air stay on Earth?

Moon Day 12
Moon Day 12

These fantastic questions got me thinking about my answers to What is air made of? and Why are there no trees on the Moon?. But neither of those quite answered these new questions. So, after much deliberation, here’s my answer!

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