See how your boat floats on the water. What else floats?
What you’ll need:
For the boat:
3 corks
2–5 elastic bands
String
An awl
A small twig
A leaf
For the figure:
1 cork
A serrated kitchen knife
A wooden board
A felt-tip pen
Toothpicks
How to do it:
1. Take three corks, lay them next to each other and bind them together with elastic bands.
2. Cut off a piece of string and tie it to the elastic bands. This will allow you to tie the boat up so it doesn’t float away.
Things float if they are lighter than water. If something is heavier than water, it sinks. If it’s lighter or hollow it will stay on the surface of the water.
3. Use the awl to poke a hole in the middle of the middle cork so that you can stick your small branch into it.
4. Stick the branch into the hole. This will be the mast for your boat.
5. Stick the leaf to the twig. You can also make holes using the awl. Now you can mount your sail on the mast.
6. Do you still need a captain or a navigator?
Cut part of the cork off with the serrated knife. Ask an adult to help you.
7. Draw a face on the cork with a felt-tip pen.
8. Use the awl to poke a hole in the middle of the cork base and insert half a toothpick into it.
Almost all water on Earth is salt water, about 97%. Only a small fraction, about 3%, is fresh water, and even of that only a fraction is suitable for direct human consumption.
9. Attach your figure to the cork boat by making a small hole with the awl and inserting the free end of the toothpick.
10. Take your cork boat outside and place it on the water.
There are more than 1,500 lakes in Switzerland. The largest lake located exclusively on Swiss soil is Lake Neuchâtel.
Why is the water in a lake blue? This is because the water catches sunlight in a particular way. It swallows red, orange and yellow colors, but reflects blue light back to us. That’s why the lake appears blue when we look at it.