Is the earth the same as it was 6 billion years ago?

no, not even close. 6 billion years ago, the Earth technically didn't exist. It was a huge mess of rocks scattered around the solar system like the asteroid belt beyond mars. the earth was actually formed 4. read more

Holmes published The Age of the Earth, an Introduction to Geological Ideas in 1927 in which he presented a range of 1.6 to 3.0 billion years. No great push to embrace radiometric dating followed, however, and the die-hards in the geological community stubbornly resisted. read more

The Earth went through a period of catastrophic and intense formation during its earliest beginnings 4.6-4.4 billion years ago. By 3.8 to 4.1 billion years ago, Earth had become a planet with an atmosphere (not like our atmosphere today) and an ocean. read more