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%
442
flagMalaysia
22%
22%
44%
11%
18
flagthe Philippines
23%
23%
37%
16%
43
flagthe Netherlands
42%
14%
35%
7%
14
flagthe United States
34%
18%
32%
14%
520
flagUnknown
30%
16%
32%
16%
43
flagAustralia
37%
15%
31%
15%
51
flagCanada
34%
17%
31%
17%
35
flagRepublic of Ireland
37%
25%
31%
6%
16
flagNigeria
7%
55%
29%
7%
27
flagPoland
29%
22%
24%
23%
7493
flagthe United Kingdom
41%
20%
22%
15%
150
flagAustria
22%
37%
22%
18%
27
flagGermany
19%
33%
20%
26%
163
flagSri Lanka
36%
36%
18%
9%
11
flagIndonesia
23%
53%
15%
7%
13