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# Gesteente wordt sediment ### In de bergen * Erosion, sedimentation and rock formation are constantly occurring in the mountains. * They are processes that take a very long time and can continue for millions of years. * Many different kinds of sediment can be found in the mountains. ### De weg v...

# Gesteente wordt sediment ### In de bergen * Erosion, sedimentation and rock formation are constantly occurring in the mountains. * They are processes that take a very long time and can continue for millions of years. * Many different kinds of sediment can be found in the mountains. ### De weg van de zandkorrel * Erosion and abrasion cause the landscape to become flatter and smoother over time. * Sedimentation occurs especially in the lowlands and deltas. * The sand carried by the river turns into beaches. ### Het ontstaan van duinen * Due to the movement of the sea, sometimes sand banks are formed. * These sandbanks can be found right in front of the beach. * The sand that accumulates on the beach, is called accretion. ### In de kustvlakte * In the coastal area, the shore is often found in a constant state of flux. * The waves constantly alter the coastline. * Due to the regular movements of the sea, there are also numerous sandbanks. * Depending on the terrain, sometimes there are small dunes. ### Het ontstaan van duinen * There is a diagram that shows how dunes develop. * It shows a cross-section of the land, with a beach, foreshore and more inland areas. * It highlights the role of wind and waves in forming dunes. * The diagram shows a dune formation process. The diagram shows a cross-section of the land, with a beach, foreshore and more inland areas. It highlights the role of wind and waves in forming dunes. The diagram shows a dune formation process: * **Step 1: **The wind carries sand grains from the beach toward the mainland. * **Step 2:** The sand grains are deposited on the beach where the wind is blocked by vegetation or other obstacles. * **Step 3:** The deposited sand grains form a small dune. * **Step 4:** The dune grows larger as more sand is deposited. * **Step 5:** The dune may eventually become a large sand dune. This is just one example of how dunes are formed. Dunes are constantly changing and can be influenced by many factors, including wind direction, vegetation, and the amount of sand available.