Creation on earth itself is still fairly unknown (from what I know)...But the demise of the dinosaurs I do know something about. 65 million years ago a 5 or 6 mile long meteor crashed into the Earth (in the Yukatan Pennislsa which is next to the Gulf of Mexico(forgive my spelling...)). The impact caused tons of dust and debrus to enter the atmostsphere, blocking out the sun and plunging the Earth into a kind of nucular winter for months. When the sun finally shone through again...all the dinosaurs along with many other animals were gone (75% of the worlds species...both on land and the water)...this great extinction paved the way for mammals to evolve.
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