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%

Greece

27%

50%

16%

Pakistan

16%

25%

46%

10%

India

17%

24%

44%

12%

452

Malaysia

22%

44%

11%

Switzerland

29%

41%

23%

the Philippines

23%

37%

16%

the United States

32%

18%

34%

14%

550

Unknown

30%

16%

32%

16%

Australia

37%

15%

31%

15%

the Netherlands

43%

12%

31%

Canada

30%

20%

30%

17%

Republic of Ireland

33%

22%

27%

16%

Nigeria

14%

52%

26%

Poland

29%

22%

24%

23%

7873

Germany

19%

33%

24%

22%

290

the United Kingdom

40%

19%

24%

14%

161

Austria

17%

44%

22%

15%

Ghana

28%

21%

14%

Indonesia

23%

53%

15%

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