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History of The Earth

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Across
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The first human on Earth. Father of mankind. First prophet.
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Many thought this organism is from the Jurassic Period, but it is not (singular form)
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It broke apart during the Mesozoic Era
Down
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Between Precambrian and the day you were born, geologists divide the "scale" into units called this.
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If you dig and dig in your backyard and found this, you can probably quit school due to the money you may get.
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By looking at its name, we can assume that this creature smiled a lot. Far from the truth. It's vicious like its modern cousin the tiger!
I know we are asking you to change your study habits quickly and that's not fair to you. This is ungraded crossword puzzle is fun! Try it.