How did Earth get its name?

Earth is the only planet in our solar system not to be named after a Greek or Roman deity. Originally, humans had no idea that they lived on a planet that was mostly water. But the crumbly, fertile substance they called ‘earth’ (from the German ‘erde’ or the old English ‘ertha’) was crucial to their survival - so when our early ancestors decided to give their home a name, they alighted upon that same vital substance: Earth. It was only later that humans discovered that 70% of our planet is actually covered in water, by which time the original name had stuck.

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