The total time period of geological scale is about _____?

ارضیاتی پیمانے کی کل مدت تقریباً _____ ہے؟

20 million years

4.6 billion years

1.6 billion years

None of these

The total time period of the geological scale is about 4.6 billion years.

This covers the Earth's formation and all the geological events up to the present.