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PRECAMBRIAN :)a+
the sea-floor spreading, and the movement of tectonic plates
4.6 billion years im pretty sure
they measure with a devise
you guys are stupid u shouldve answered this by now. they use rocks. the end.
PRECAMBRIAN :)a+
first era was the Precambrian
dust and ice and other partcials
the sea-floor spreading, and the movement of tectonic plates
No one knows for sure about how the layers formed. Scientists are trying to find out how. SORRY : (
Because the earth was formed by the sun and the sun and earth are in the solar system." Answered by a third grader."
to understand why mountains and trenches formed
They believe the planets formed from a disc of gas and dust called a "protoplanetary disc".
Volcano Eruptions
It was actually the Earth that was shaped in its orbit in the sun. Scientists estimate it was 4.5 billion years ago when the Earth was formed.
4.6 billion years im pretty sure
An intrusive igneous rock.