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.

Answers distribution

carbon
oxygen
iron
silicon
answers
flagCroatia
0%
0%
92%
7%
13
flagItaly
20%
6%
60%
13%
15
flagNigeria
8%
33%
58%
0%
12
flagthe United Arab Emirates
30%
15%
53%
0%
13
flagPakistan
24%
12%
52%
8%
25
flagCanada
28%
10%
47%
13%
46
flagIndia
17%
20%
44%
15%
243
flagGermany
17%
13%
42%
26%
68
flagNorway
31%
10%
42%
15%
19
flagMalaysia
28%
28%
42%
0%
14
flagthe United States
30%
17%
37%
14%
489
flagthe United Kingdom
31%
18%
34%
15%
191
flagthe Philippines
18%
21%
34%
18%
32
flagAustralia
37%
15%
32%
15%
40
flagIndonesia
15%
53%
30%
0%
13
flagPoland
28%
20%
29%
22%
4480
flagthe Netherlands
41%
23%
29%
5%
17
flagRepublic of Ireland
35%
30%
25%
10%
20
flagFrance
58%
16%
16%
8%
12

Gender

men31%
women27%
carbon
27%
30%
oxygen
18%
18%
iron
31%
27%
silicon
22%
23%

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What is the most common element (by mass) forming the planet Earth?
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