Which type of a coal is the youngest?

lignite (brown coal)
graphite
bituminous coal
anthracite
Coal forms when the dead plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, then bituminous coal, and lastly anthracite.
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Answers by country

lignite (brown coal)
graphite
bituminous coal
anthracite
answers
flagRepublic of Ireland
82%
5%
0%
11%
17
flagthe Netherlands
75%
0%
16%
8%
12
flagNigeria
68%
18%
6%
6%
16
flagGreece
66%
6%
6%
20%
15
flagGermany
62%
15%
12%
8%
370
flagRomania
54%
27%
18%
0%
11
flagPoland
53%
15%
12%
17%
10070
flagAustralia
53%
20%
10%
16%
49
flagPakistan
53%
21%
7%
17%
28
flagItaly
52%
21%
5%
15%
19
flagIndia
50%
17%
15%
14%
178
flagthe United Kingdom
50%
21%
17%
9%
120
flagAustria
50%
22%
15%
12%
58
flagUkraine
50%
25%
12%
12%
32
flagthe Philippines
48%
27%
13%
9%
43
flagthe United States
38%
24%
22%
13%
580
flagCanada
38%
35%
12%
12%
31
flagthe United Arab Emirates
38%
23%
23%
15%
13
flagSwitzerland
37%
20%
17%
13%
29
flagUnknown
31%
25%
12%
31%
16