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This is an iron buoy. Where were its atoms formed?

in a high-mass star preceding Sun
in the Sun
in the Earth's core
in the Earth's crust
Radioactive nickel-56 (which decays to the most common isotope of iron) is the last element to be produced before the collapse of a supernova. That is why the iron was abundantly scattered into space after the supernova explosion.
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in a high-mass star preceding Sun
in the Sun
in the Earth's core
in the Earth's crust
answers
flagthe Netherlands
69%
8%
4%
17%
23
flagAustralia
43%
7%
24%
24%
82
flagUnknown
42%
9%
29%
16%
54
flagFrance
41%
17%
23%
17%
17
flagPakistan
40%
6%
33%
15%
89
flagthe United Kingdom
38%
12%
26%
20%
257
flagSingapore
37%
8%
45%
8%
24
flagthe United Arab Emirates
37%
0%
37%
25%
16
flagthe United States
36%
9%
31%
19%
803
flagCanada
35%
15%
23%
23%
51
flagGreece
35%
7%
21%
35%
14
flagthe Philippines
34%
10%
28%
23%
67
flagGermany
34%
7%
34%
23%
52
flagRepublic of Ireland
33%
20%
33%
13%
15
flagIndia
32%
11%
37%
18%
792
flagMalaysia
28%
9%
25%
37%
32
flagGhana
28%
9%
28%
28%
21
flagPoland
27%
9%
31%
31%
11759
flagNigeria
22%
5%
26%
44%
68
flagSouth Africa
18%
12%
31%
37%
16

How do baby birds get oxygen inside their eggs?

They have a large oxygen supply from the start
Oxygen is created during protein reduction
Oxygen comes in through pores in the shell
They don't need oxygen at all

When is the Eiffel Tower the highest?

In winter
In spring
In summer
In autumn

Does the candle burn more or less violently in zero gravity?

more violently
about the same
less violently
nobody knows

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

carbon
oxygen
iron
silicon