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

78%

14%

Nigeria

68%

18%

Greece

66%

20%

Germany

64%

13%

429

Romania

54%

27%

18%

Poland

53%

15%

12%

17%

10221

Australia

53%

20%

10%

16%

Pakistan

53%

21%

17%

the United Kingdom

52%

20%

16%

129

Italy

52%

21%

15%

India

51%

17%

15%

14%

182

Ukraine

51%

24%

12%

Austria

50%

21%

16%

11%

the Philippines

48%

27%

13%

the United States

40%

23%

21%

13%

615

Switzerland

40%

21%

16%

13%

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)