There was one supercontinent during dinosaur time, it was called Pangaea.

Pangaea was a supercontinent. Then as years went by it started to break apart into two giant continents. Dinosaurs were still on earth when the super continent broke apart.

Gondwana was a giant continent that broke apart from the supercontinent Pangaea. The supercontinent broke apart and paleontologists thought that the dinosaurs would go extinct from the disaster.

Laurasia is another one of the giant continents. It was split apart from Gondwana.

Today's continents were broke apart from the supercontinent. The continents of today were part of Pangaea.