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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.

Ts

3

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Answers by country

Australia

85%

5%

10%

0%

20

Greece

73%

20%

6%

0%

15

India

58%

16%

16%

9%

43

Germany

44%

37%

6%

12%

81

Poland

42%

19%

16%

20%

1628

the United Kingdom

35%

38%

12%

9%

31

the United States

31%

31%

28%

8%

80

Austria

30%

23%

38%

7%

13

Republic of Ireland

27%

54%

18%

0%

11

What's the origin of the word "turquoise"?

Turku City in Finland

Turkey as a country

Turkusy, fake region

Persian tortoise

What is the largest known diamond in the world?

Which of this mineral is the best diamond alternative?

strontium titanate

What years did the Great Depression occur?