What is the oldest rock in the world?

gneiss
basalt
quartzite
syenite
The Acasta Gneiss in the Canadian Shield in the Northwest Territories, Canada is composed of the Archaean igneous and gneissic cores of ancient mountain chains that have been exposed in a glacial peneplain. Analyses of zircons from a felsic orthogneiss with presumed granitic protolith returned an age of 4.031 ±0.003 Ga.
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Very interesting!
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Answers by country

gneiss
basalt
quartzite
syenite
answers
flagAustralia
85%
5%
10%
0%
20
flagGreece
73%
20%
6%
0%
15
flagIndia
58%
16%
16%
9%
43
flagGermany
45%
34%
7%
12%
93
flagPoland
42%
20%
16%
20%
1642
flagthe United Kingdom
35%
38%
12%
9%
31
flagthe United States
32%
30%
28%
8%
82
flagAustria
30%
23%
38%
7%
13
flagRepublic of Ireland
25%
50%
25%
0%
12