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
75%
6%
12%
6%
16
flagFinland
70%
10%
20%
0%
10
flagthe United States
60%
13%
6%
18%
43
flagBelgium
60%
0%
30%
10%
10
flagGermany
59%
4%
19%
16%
62
flagthe United Kingdom
54%
10%
15%
18%
90
flagRepublic of Ireland
52%
11%
23%
11%
17
flagthe Netherlands
48%
3%
24%
24%
66
flagPoland
46%
12%
20%
20%
3419
flagUnknown
36%
0%
45%
18%
11
flagFrance
30%
0%
20%
50%
10
flagIndia
16%
0%
58%
25%
12

Gender

men48%
women43%
peat extraction
48%
44%
tectonic movements
10%
15%
rise of the ocean level
18%
21%
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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