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

Answer: 4.6 billion years

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.