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
flagGreece
27%
5%
50%
16%
18
flagPakistan
17%
22%
48%
10%
58
flagIndia
17%
24%
44%
13%
444
flagMalaysia
22%
22%
44%
11%
18
flagthe Philippines
23%
23%
37%
16%
43
flagthe Netherlands
42%
14%
35%
7%
14
flagCanada
33%
16%
33%
16%
36
flagthe United States
33%
18%
32%
14%
521
flagUnknown
30%
16%
32%
16%
43
flagAustralia
37%
15%
31%
15%
51
flagRepublic of Ireland
37%
25%
31%
6%
16
flagNigeria
7%
55%
29%
7%
27
flagPoland
29%
22%
24%
23%
7513
flagAustria
20%
36%
23%
20%
30
flagthe United Kingdom
41%
20%
22%
15%
150
flagGermany
18%
34%
19%
27%
175
flagSri Lanka
36%
36%
18%
9%
11
flagIndonesia
23%
53%
15%
7%
13