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Why is the sky blue?
Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
What makes a red sunset?
As the Sun gets lower in the sky, its light is passing through more of the atmosphere to reach you. Even more of the blue light is scattered, allowing the reds and yellows to pass straight through to your eyes.
Lightning strikes produce O3, which is ozone, and strengthen the ozone layer of the atmosphere.
The only elements that are liquid at room temperature are bromine and mercury. However, you can melt gallium by holding a lump in the warmth of your hand.
The only two non-silvery metals are gold and copper.
If you mix half a liter of alcohol with half a liter of water, the volume of the mixture will be less than one liter.
Liquid water is more dense than solid water (ice).
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