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Isthmus

From time to time they join Tony to take samples on the Isthmus. They chip off pieces of the rock layers and take the samples back to their laboratories. There they study the fossils and minerals, or non-living material, from the layers.
On a map the Isthmus looks like a thin thread of land being washed away by the oceans. But the Isthmus is actually growing. Over millions of years it has slowly risen up out of the sea. As the Isthmus rose it joined North America and South America and divided the Atlantic and Pacific Oceans.

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David Stevenson