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
25%
6%
56%
12%
16
flagGreece
27%
5%
50%
16%
18
flagPakistan
16%
25%
46%
10%
60
flagIndia
17%
24%
44%
12%
452
flagMalaysia
22%
22%
44%
11%
18
flagthe Philippines
23%
23%
37%
16%
43
flagSwitzerland
6%
31%
37%
25%
16
flagthe United States
33%
18%
33%
14%
541
flagUnknown
30%
16%
32%
16%
43
flagAustralia
37%
15%
31%
15%
51
flagthe Netherlands
43%
12%
31%
6%
16
flagCanada
30%
20%
30%
17%
39
flagRepublic of Ireland
33%
22%
27%
16%
18
flagNigeria
14%
52%
26%
7%
42
flagPoland
29%
22%
24%
23%
7843
flagthe United Kingdom
40%
19%
24%
14%
161
flagAustria
16%
44%
23%
16%
43
flagGermany
19%
34%
22%
23%
268
flagGhana
28%
21%
21%
14%
14
flagIndonesia
23%
53%
15%
7%
13