Scientist think this region may have once been a large sea

The scientists think that Interior Plains may have once been a large sea.

Explanation: The Interior Plains refers to a widespread physiographic region. It starts from the craton of central-North America, crossing the Gulf Coast region till the Arctic Ocean alongside the east flank of the Rocky Mountains. This area originated when billion years ago, cratons collided and welded together. Sometimes, these plains were covered by inland seas because of which the Rocky Mountains and sediments from the shield were deposited over millions of years.

you should think about the answers you give and expect the same form your questions.

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.