Sediment is particles of matter that settle to the bottom of liquids. Over long periods, deposits of mineral and organic sediment accumulate at the bottom of lakes, seas, or flood plains. They often cement into rocks, and then occasionally get exposed or uplifted by geological activities to form new mountains. Once exposed, erosion reverses the process by gradually wearing them away. Each color band visible in sedimentary deposits represents a distinct geological event.
Limestone sedimentary rocks form the Northern Highlands, including Ajloun, Amman, and Karak. Sandstone sedimentary rocks form the Southern Highlands, including Wadi Dana, Petra, and Wadi Rum.