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

carbon
oxygen
iron
silicon
answers
flagFrance
26%
6%
60%
6%
15
flagRomania
33%
0%
58%
8%
12
flagPakistan
17%
21%
50%
8%
56
flagGreece
29%
5%
47%
17%
17
flagMalaysia
26%
20%
46%
6%
15
flagIndia
17%
24%
44%
13%
429
flagthe Philippines
21%
24%
36%
17%
41
flagthe Netherlands
42%
14%
35%
7%
14
flagthe United States
34%
18%
32%
14%
514
flagAustralia
38%
16%
32%
14%
50
flagUnknown
30%
16%
32%
16%
43
flagCanada
35%
17%
29%
17%
34
flagRepublic of Ireland
42%
21%
28%
7%
14
flagNigeria
10%
55%
25%
10%
20
flagPoland
30%
22%
23%
23%
7418
flagthe United Kingdom
42%
19%
22%
15%
147
flagGermany
17%
33%
20%
28%
145
flagSri Lanka
36%
36%
18%
9%
11
flagIndonesia
23%
53%
15%
7%
13
flagAustria
19%
42%
14%
23%
21