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Scientists believe that the earth's atmosphere has been in existence for over 3.5 billion years. This is based on the fossil records that are found which date to so many years.
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∙ 9y ago
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When was earth planet discovered?
When humans evolved and realized they were standing on something.
Why is Earth day approximalety 24 hours long?
because that is how long the earth takes to make 1 full rotation on its axis
How long will it be until the earth is uninhabitable?
You do not say what will harm the earth. The earth is a dynamic planet, if it did not have the processes which cause earthquakes and volcanoes it would be a dead planet. While earth stays dynamic, constantly active, it is the perfect place for us.
How long have the storms on earth been going on?
Ever since the earth formed, about 4 billion years ago.
How thick is earth's crust in miles?
It is 25 miles long.
Did sharks appear when dinosaur extinct?
No. Sharks appeared on earth long before the first dinosaurs did.
How long after contamination of listeria bacteria do symptoms appear?
After consuming food contaminated with this bacteria, symptoms of infection may appear anywhere from 11-70 days later.
Where and when did toys first appear?
every since rocks came 2 earth along with mud pies
When did elephants appear on earth?
in the ice age the mammoths were the first elephants
How long ago did mans first ancestor appear?
on the 12th of march
Why does the sun appear the be the brightest star in the sky to us on earth?
because it is the nearest star by a long way
Why do the stars in the night sky appear tinier than the Earth?
Because they are a VERY long way away.
Where are Bacterias located?
bacteria usaly grows in drack,moist andwarm places it can also form in foods or liguids left out to long
How long have reptiles inhabited the earth?
Reptiles inhabited the earth before dinosaurs inhabited the earth. The first reptiles appear in the fossil record over 300 million years ago, in the Carboniferous period of the Paleozoic era.
When did numbers as we know them first appear?
A Long...Long....Long....Long......Long....Long.....Long...Long.......Long.....Long....Long..Long Time Ago XD
How long ago did the first dinosaurs appear?
About 230 million years ago.
How long ago did dinos start to roam Earth?
Dinosaurs stated to appear 240 million years ago.
