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Huff, puff and blow as hard as you can—do you think you can blow down a sand castle with your mighty breath? Blowing air erodes—wears away—sand and dirt. In Three Little Pigs, houses of straw or twigs ...
It doesn't take a degree in chemistry to know that water is made up of two elements: hydrogen and oxygen. Sure, you're familiar with that famous formula, but did you know that some types of water can ...