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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Answers by country
gneiss
basalt
quartzite
syenite
answers
Australia
20
Greece
15
India
43
Germany
92
Poland
1640
the United Kingdom
31
the United States
82
Austria
13
Republic of Ireland
12