9781422278031

Words to Understand dams: Barriers (as across streams) to hold back flows of water. dikes: Mounds of earth built to control water. sand dunes: Hills of sand.

BELOW: The famous Kinderdijk windmills are situated in the Alblasserwaard polder in the province of South Holland. They were originally used to pump excess water from the polders. The windmills were granted UNESCO World Heritage status in 1997.