Our Earth is very old, approximately 4.5 billion years old and it has seen many changes over the course of its life and will see many more. Humans as we know them today are very young species, it might not seem like according to our own precived time frame with minutes and seconds, but the earth and the species that inhabit it have evolved over billions of years.

So, where and how did the earth begin? Well that question hasn't been completely answered. The Earth has left us clues of the history it has had to endure in the forms of fossils. We have learned a lot about the past from the fossils that have been found to date, but there is more to learn. The fossil record can only show us partial history of the earth, some past species didn't form fossils, some fossils decomposed and other have not been found; it is estimated that we have only found fossils for 1% of species that ever existed. Fossils, chemical and radioactive dating, DNA sequencing, and cores drilled in ice along will many other things has resulted in our knowledge of the great history that the Earth has.