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
flagthe United Arab Emirates
90%
0%
9%
0%
11
flagNorway
81%
6%
12%
0%
16
flagFinland
75%
8%
16%
0%
12
flagItaly
59%
9%
27%
4%
22
flagthe United Kingdom
56%
9%
16%
16%
120
flagGermany
56%
6%
18%
17%
74
flagBelgium
53%
0%
30%
15%
13
flagthe United States
52%
15%
9%
21%
51
flagPoland
46%
13%
19%
20%
4444
flagthe Netherlands
46%
4%
24%
24%
90
flagRepublic of Ireland
40%
9%
31%
18%
22
flagSwitzerland
36%
0%
18%
45%
11
flagUnknown
31%
14%
21%
32%
138
flagFrance
30%
0%
20%
50%
10
flagIndia
15%
0%
61%
23%
13

Gender

men45%
women43%
peat extraction
45%
44%
tectonic movements
13%
15%
rise of the ocean level
17%
21%
building dams over rivers
23%
18%

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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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