Special 3-D photographs which have been taken with laser beams (and which make the objects look real) are called what?
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The amount of water vapour in the air is called...?
What invisible force holds you onto the earth, so that you don't simply fall off?
Potassium Permanganate is used for purifying drinking water, because
Balloons are filled with
In fireworks, the green flame is produced because of
Heavy water is
The gases used in different types of welding would include
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