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.
earth cooled suffciently
millions and millions of years ago
Perhaps as bacteria have been around millions of years longer than humans.
Its a thing called 'The Moon'. It's been there for millions of years.
No, the Earth was uninhabitable for millions of years.
volcanoes take millions of years to occur. it changes earth's surface.
Not just millions. Earth has sustained life for several billion years.
volcanoes take millions of years to occur. it changes earth's surface.
probally around millions of years. they say they were here before electricity
the earth has been existing for billions years. Just because it is 2010, doesn't mean that's how old it is. I believe the earth has been around for millions, billions of years!:)
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
Millions of years