Examples of 'four billion years ago' in a sentence
Meaning of "four billion years ago"
four billion years ago: This phrase denotes a vast period in the past, specifically referring to a time four billion years prior to the present. It is often used in scientific contexts or discussions about the history of the Earth or universe
How to use "four billion years ago" in a sentence
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four billion years ago
It began around four billion years ago.
Four billion years ago it was a different story.
Four point four billion years ago.
Four billion years ago followed the earth in its mineral form.
Clues that three or four billion years ago.
About four billion years ago one became two.
From a time almost four billion years ago.
Four billion years ago Earth was bombarded by a hail of comets and asteroids.
When it formed over four billion years ago.
Four billion years ago Earth was probably surrounded by debris ejected in this way.
Life began in water four billion years ago.
Four billion years ago As the molten Earth cooled, a vast world ocean was formed.
Someone wrote this over four billion years ago.
About four billion years ago.
This was our planet nearly four billion years ago.
See also
But around four billion years ago it was a different story.
And this is about a little over four billion years ago.
That was four billion years ago.
It first appeared in the sea almost four billion years ago.
The process started four billion years ago and it still continues today.
Their surfaces date from at least four billion years ago.
The Earth of four billion years ago was a chaotic, irradiated, hot ….
The earth was born more than four billion years ago.
Three to four billion years ago the Sun emitted only 70 % of its current power.
And what is true now was equally true four billion years ago.
Now this quest started four billion years ago on planet Earth.
Chemical reactions led to the first self-replicating molecules about four billion years ago.
Primeval earth, four billion years ago.
An artist 's impression of what Mars was probably like about four billion years ago.
In its infancy, four billion years ago.
Spirit and Opportunity have shown us that once, three to four billion years ago.
Scientists believe that somewhere around four billion years ago life emerged on Earth.
Our Moon teemed with volcanic activity … three to four billion years ago.
Welcome to the Earth of four billion years ago.
This theory suggests that Mars was struck by a Pluto-sized body about four billion years ago.
This is Earth . Four point four billion years ago.
It happened in the deep ocean darkness on September 15, about four billion years ago.
This is what our world looked like four billion years ago.
And that 's what kept water liquid on the Earth 's surface four billion years ago.
It had happened before, since four billion years ago.
We have no fossil record of the way life was four billion years ago.
The first marine life formed . Four billion years ago.
The others are just as old . Someone wrote this over four billion years ago.
Mars lost most of its magnetic field about four billion years ago.
They could have survived on Mars three or four billion years ago.
Someone scattered this genetic material So, four billion years ago.
A terrible chain reaction began . About four billion years ago.
Fragments from that comet impacted a planet . Four billion years ago.
Mars was struck by a Pluto-sized body about four billion years ago.
But how did you figure that out? About four billion years ago.
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Examples of using Ago
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Two thanksgivings ago was the first time
Years ago the earth was nearly destroyed
Until a few hours ago he was with them
Examples of using Billion
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We are talking about a billion dollar weapons project
Billion people are without access to basic sanitation
You and seven billion other people
Examples of using Years
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They spent two years digging a tunnel
Years of expertise in every aspect of machine tools
I waited five years for that space
