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
81%
6%
12%
0%
16
flagFinland
72%
9%
18%
0%
11
flagItaly
61%
9%
23%
4%
21
flagthe United Kingdom
57%
9%
16%
16%
117
flagGermany
57%
5%
20%
17%
70
flagBelgium
54%
0%
27%
18%
11
flagthe United States
52%
15%
9%
21%
51
flagPoland
46%
12%
19%
20%
4319
flagthe Netherlands
45%
5%
25%
25%
80
flagRepublic of Ireland
42%
9%
33%
14%
21
flagUnknown
30%
14%
20%
33%
121
flagFrance
30%
0%
20%
50%
10
flagIndia
15%
0%
61%
23%
13

Gender

men45%
women44%
peat extraction
45%
44%
tectonic movements
12%
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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