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
flagPakistan
18%
22%
50%
8%
50
flagGreece
33%
6%
46%
13%
15
flagMalaysia
26%
20%
46%
6%
15
flagIndia
17%
24%
43%
13%
375
flagthe Netherlands
50%
10%
40%
0%
10
flagthe Philippines
23%
23%
38%
15%
39
flagNigeria
7%
50%
35%
7%
14
flagUnknown
30%
16%
32%
16%
43
flagCanada
34%
15%
31%
18%
32
flagthe United States
35%
19%
30%
14%
493
flagAustralia
36%
18%
29%
15%
44
flagRepublic of Ireland
45%
27%
27%
0%
11
flagPoland
30%
22%
23%
23%
7031
flagthe United Kingdom
43%
14%
23%
17%
128
flagGermany
17%
27%
22%
32%
86
flagIndonesia
23%
53%
15%
7%
13
flagAustria
22%
44%
11%
22%
18