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%
10%
0%
10
flagNorway
86%
0%
13%
0%
15
flagFinland
70%
10%
20%
0%
10
flagItaly
66%
5%
22%
5%
18
flagthe United States
60%
13%
8%
17%
45
flagBelgium
60%
0%
30%
10%
10
flagthe United Kingdom
57%
9%
14%
18%
98
flagGermany
57%
5%
20%
15%
69
flagRepublic of Ireland
50%
11%
27%
11%
18
flagPoland
47%
12%
19%
20%
3631
flagthe Netherlands
47%
4%
23%
24%
69
flagUnknown
46%
0%
33%
20%
15
flagFrance
30%
0%
20%
50%
10
flagIndia
16%
0%
58%
25%
12

Gender

men49%
women44%
peat extraction
49%
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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