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
flagRomania
27%
0%
63%
9%
11
flagFrance
30%
7%
53%
7%
13
flagPakistan
16%
20%
50%
9%
53
flagGreece
29%
5%
47%
17%
17
flagMalaysia
26%
20%
46%
6%
15
flagIndia
16%
24%
44%
14%
404
flagthe Philippines
23%
23%
38%
15%
39
flagthe Netherlands
41%
16%
33%
8%
12
flagUnknown
30%
16%
32%
16%
43
flagthe United States
34%
18%
31%
14%
505
flagAustralia
38%
16%
30%
14%
49
flagCanada
33%
18%
30%
18%
33
flagNigeria
5%
52%
29%
11%
17
flagRepublic of Ireland
50%
25%
25%
0%
12
flagPoland
30%
22%
23%
23%
7234
flagthe United Kingdom
42%
17%
22%
16%
136
flagGermany
17%
30%
22%
28%
114
flagSri Lanka
36%
36%
18%
9%
11
flagAustria
21%
42%
15%
21%
19
flagIndonesia
23%
53%
15%
7%
13