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

Republic of Ireland

82%

11%

the Netherlands

75%

16%

Nigeria

68%

18%

Greece

66%

20%

Germany

62%

14%

13%

397

Romania

54%

27%

18%

Poland

53%

15%

12%

17%

10154

Australia

53%

20%

10%

16%

Pakistan

53%

21%

17%

Italy

52%

21%

15%

the United Kingdom

51%

21%

17%

123

Ukraine

51%

24%

12%

India

50%

17%

15%

14%

179

Austria

50%

21%

16%

11%

the Philippines

48%

27%

13%

the United States

39%

23%

21%

13%

595

Switzerland

39%

21%

18%

12%

Canada

38%

35%

12%

the United Arab Emirates

38%

23%

15%

Unknown

31%

25%

12%

31%

Which desert has this famous "eye"?

Which of the following European mountain ranges will rise the most in the next century?

Carpathian Mountains

Alps

Pyrenees

Scandinavian Mountains

This kind of tilted forest is a common sight in subarctic taiga. What is this phenomenon caused by?

What is the largest carnivore mammal? (apart from whales)