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Scientists have been studying and because of the big bang they were able to determine how long earth has been around. Also, ever heard of dinosaurs? When they found fossils they were able to look at the imprint they made and yeah...
Actually, most scientists agree that the Earth has been around for about 4.5 billion years. They know this because of the fossil and geological records, but primarily because they have been able to analyze radioactive decay in comparision with the expected half-life of the various radioactive isotopes that exist today.
What else can I help you with?
What happened around 800 millions years after earth formed to allow rock formations?
earth cooled suffciently
When were humans on earth?
millions and millions of years ago
Do bacteria adapted better life on the earth than human beings?
Perhaps as bacteria have been around millions of years longer than humans.
What is the name of the object that orbits around the earth?
Its a thing called 'The Moon'. It's been there for millions of years.
Was there life on earth from the start?
No, the Earth was uninhabitable for millions of years.
What events always take millions of years to change the surface of the earth?
volcanoes take millions of years to occur. it changes earth's surface.
What event always takes millions of years to change the surface of the earth?
volcanoes take millions of years to occur. it changes earth's surface.
Is it true that earth today has been sustaining life for millions of years?
Not just millions. Earth has sustained life for several billion years.
How long have the Tasmanian devils been on earth?
probally around millions of years. they say they were here before electricity
Is it true that every solar eclipse happens every million years on earth?
no they happen around the world almost every year and i dont believe that were going to be here on this earth for millions of years
How long ago was there life on Earth?
Millions of years
When did dinosaurs came on earth?
millions of years ago
