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History of The Earth

Across
The first human on Earth. Father of mankind. First prophet.
Many thought this organism is from the Jurassic Period, but it is not (singular form)
It broke apart during the Mesozoic Era
Down
Between Precambrian and the day you were born, geologists divide the "scale" into units called this.
If you dig and dig in your backyard and found this, you can probably quit school due to the money you may get.
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!