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What do the great dinosaur fossil locations in the world have in common?
The badlands of Argentina.
The badlands of Argentina are a popular spot for collecting dinosaur fossils.

First, they are in the middle of very stable continents. A stable continent is one without a lot of earthquakes, volcanic eruptions, or other major geological events that would destroy the fossils. Second, they have the kinds of landforms that preserve fossils well, such as badlands. In badlands, the forces of erosion, such as wind and water, have exposed layers of rock that contain fossils.