Post on 31-Dec-2015
Polders: Land from the Sea
• Dikes-earthen banks
• 40% of the Netherlands was once under water
• Polder-land that is reclaimed by diking and draining
Seaworks
• Structures that are used to control the sea’s destructive impact on human life
• Windmills used to power pumps that drained the land
Waterways for Commerce: Venice’s Canals
• Venice, Italy-120 small islands and part of the mainland
• The Grand Canal flows between them
Problems
• Weight of buildings compressed the land-Venice is gradually sinking
• Flooding-rising sea levels
• Water pollution damages foundations
Deforestation
• Clearing of forest from an area• One cause of tree death is acid rain• Factories produce high amounts of sulfur
dioxide and nitrogen oxide emissions• This combines with
water vapor to form acid rain or snow