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
flagthe United Arab Emirates
23%
11%
64%
0%
17
flagItaly
20%
6%
60%
13%
15
flagNigeria
8%
33%
58%
0%
12
flagPakistan
21%
10%
57%
7%
28
flagCanada
28%
10%
47%
13%
46
flagIndia
17%
20%
44%
15%
248
flagMalaysia
28%
28%
42%
0%
14
flagGermany
16%
15%
40%
26%
71
flagNorway
30%
15%
40%
15%
20
flagthe United States
30%
16%
37%
14%
507
flagthe Philippines
18%
21%
34%
18%
32
flagthe United Kingdom
31%
19%
33%
15%
199
flagAustralia
35%
14%
33%
16%
42
flagPoland
27%
20%
29%
22%
4758
flagIndonesia
14%
57%
28%
0%
14
flagUU
8%
30%
26%
34%
23
flagthe Netherlands
47%
21%
26%
5%
19
flagRepublic of Ireland
35%
30%
25%
10%
20
flagFrance
62%
18%
12%
6%
16

Gender

men31%
women26%
carbon
27%
30%
oxygen
18%
18%
iron
31%
26%
silicon
23%
24%

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