What was earth like 3.5 billion years ago?

Answer 1

Earth 3.5 billion years ago, was nothing like what it is today. No plants, animals, nothing. Volcanoes erupted poisonous gases, methane and ammonia was in the atmosphere, and it would have been impossible to breathe. The Earth was also only one continent (until it was later broken up into several, which is another topic). Acidic rain, and deadly thunderstorms occurred for several millions of years. This is a shot in the dark, but it most likely (as we have no actual idea of what it *looked* like) resembled Mars. Lifeless, and unlivable. By the way, I find it odd that if the earth is 4 billion years old, and Mars is just as old, why there is no life on Mars (at least nothing like Earth's life), but there is life on the Earth. Kind of an interesting question huh?

Answer 2

75 million years ago earth was in the late Cretaceous period. The continents were starting to take on their modern shapes. There were no ice caps at the poles and the global climate was very warm. At this time the dominant land vertebrates were dinosaurs. Mammals had already been around for some time, but they were small and generally insignificant.

Answer 3

Like the Earth was all icy. Some people beleive that the dinosaurs got killed by these Ice ages, and some people think it was a humungous meteorite.This was the time when all the coutries were connected.And then this icycle storm spreaded the earth on all the connected countries. Now scientific people can now find there bones.
Lots of snow and ice. Think "frozen."