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
flagPakistan
17%
21%
51%
7%
52
flagGreece
31%
6%
50%
12%
16
flagFrance
33%
8%
50%
8%
12
flagMalaysia
26%
20%
46%
6%
15
flagIndia
16%
24%
43%
14%
392
flagthe Philippines
23%
23%
38%
15%
39
flagthe Netherlands
45%
18%
36%
0%
11
flagNigeria
6%
46%
33%
13%
15
flagUnknown
30%
16%
32%
16%
43
flagthe United States
34%
18%
31%
14%
504
flagAustralia
38%
16%
30%
14%
49
flagCanada
33%
18%
30%
18%
33
flagRepublic of Ireland
50%
25%
25%
0%
12
flagPoland
30%
22%
23%
23%
7167
flagthe United Kingdom
42%
17%
22%
16%
132
flagGermany
16%
29%
22%
29%
107
flagSri Lanka
36%
36%
18%
9%
11
flagAustria
21%
42%
15%
21%
19
flagIndonesia
23%
53%
15%
7%
13