Earth Science Question:
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When, in the geologic column, did dinosaurs become extinct:

Earth Science Interview Question
Earth Science Interview Question

Answer:

1. at the Cretaceous-Tertiary boundary
2. at the Jurassic-Cretaceous boundary
3. at the Triassic-Jurassic boundary
4. at the Permian-Triassic boundary

Answer: 1

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Which will most likely form when a steep mountain stream flows abruptly onto a flat plain:When, in the geological time scale, did dinosaurs first appear: