What is the most common element (by mass) forming the planet Earth?

carbon

oxygen

iron

silicon

Iron is most abundant in the Earth's outer and inner core, and it is the fourth most common element in the Earth's crust.

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Answers by country

France

25%

56%

12%

Romania

30%

53%

Greece

27%

50%

16%

Pakistan

16%

25%

46%

10%

India

17%

24%

44%

12%

453

Malaysia

22%

44%

11%

Switzerland

27%

38%

27%

the Philippines

23%

37%

16%

the United States

32%

17%

35%

14%

557

Unknown

30%

16%

32%

16%

Australia

37%

15%

31%

15%

Republic of Ireland

31%

21%

31%

15%

the Netherlands

43%

12%

31%

Canada

30%

20%

30%

17%

Nigeria

14%

52%

26%

Germany

18%

32%

25%

22%

300

the United Kingdom

40%

18%

25%

15%

164

Poland

29%

22%

24%

23%

7935

Austria

17%

44%

22%

15%

Ghana

28%

21%

14%

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