In the Middle Ages large areas of the Netherlands were flooded by the sea. What was the reason?

peat extraction
tectonic movements
rise of the ocean level
building dams over rivers
Most of the areas below sea level are man-­made, caused by cen­turies of ex­ten­sive and poorly con­trolled peat ex­trac­tion, lowering the surface by several meters. Even in flooded areas peat ex­trac­tion con­tin­ued through turf dredg­ing.

Answers distribution

peat extraction
tectonic movements
rise of the ocean level
building dams over rivers
answers
flagNorway
86%
0%
13%
0%
15
flagItaly
80%
6%
6%
6%
15
flagGermany
64%
6%
10%
18%
48
flagBelgium
60%
0%
30%
10%
10
flagRepublic of Ireland
56%
12%
18%
12%
16
flagthe United States
51%
18%
9%
21%
33
flagthe United Kingdom
50%
10%
16%
21%
74
flagthe Netherlands
50%
3%
22%
24%
58
flagPoland
45%
12%
20%
20%
3083
flagIndia
18%
0%
54%
27%
11

Gender

men49%
women43%
peat extraction
49%
43%
tectonic movements
10%
15%
rise of the ocean level
18%
20%
building dams over rivers
22%
19%

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In the Middle Ages large areas of the Netherlands were flooded by the sea. What was the reason?
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Author: Kasia
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