Question

How long did the Precambrian era last?

Answer 1

Hint: The Precambrian era was set before the current Phanerozoic Eon and is considered as the earliest part of history. It is the age where rocks were first researched.

Complete answer:
The Earth is about 600 million years old, since life has begun. Many scientists believe these primitive seas gave rise to life, with hot, mineral-rich volcanic holes behaving as catalysts for chemical consequences across the surface which led to the first cell membranes. Other bubbles are believed to have created self-replicating elements by attracting chemicals from around them. Over time the two integrated to generate energy-using, living cells.
The Precambrian era is the longest era in Earth's presence and is regarded as a Supereon. This is because it is split up into several eons. The three eons are the Hadean, the Archean and the Proterozoic. It is also the longest geologic eon, lasting for about 4.6 billion years.
During the long duration of the Precambrian period, the climatic conditions of Earth altered extensively. The evidence of this is the sedimentary record, which states noticeable differences in the texture of the atmosphere and oceans over time.

Note: Phanerozoic Eon was the shortest era. The fossils of Precambrian rocks are rare. This is because Precambrian life-forms lacked bones, or other hard parts that generally formed fossils. Stromatolites is one of the few Precambrian fossils that have been discovered.