Question

in which period did the formation of coal takes place​

Answer 1

Answer:

Carboniferous period

The conditions that would eventually create coal began to develop about 300 million years ago, during the Carboniferous period. During this time, the Earth was covered in wide, shallow seas and dense forests.

Answer 2

Answer:

The formation of coal occurs over millions of years via a process known as carbonation. In this process, dead vegetation is converted into carbon-rich coal under very high temperature and pressure.