What Is Quicksand?
Quicksand is a deep mass of sand so mixed with water that it will not support any weight. It forms when ground water pushes up and mixes into the sand above, making it...
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Why Is Gold Measured in Carats?
Why Is Gold Measured in Carats? The term carat comes from the name of the bean of the carob tree. In earlier times, carob beans were used to measure the weight of gold...
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Who Steers a Train?
Believe it or not, nobody steers a train. The wheels of a train and its rails work together to steer the train. The wheels of a train have a special shape. Each one has...
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How Does an Anchor Hold a Ship?
How Does an Anchor Hold a Ship? The weight of a simple cement-can anchor can keep a fisherman’s small boat from drifting away. The iron anchors of ships have flukes...
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How Much Does the Earth Weigh?
How Much Does the Earth Weigh? Scientists estimate that the Earth weighs about 7 sextillion tons! To get an idea of what that number looks like, you’d have to write a...
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