Question

The _______ era encompasses 90 percent of Earth's history.
Some of the oldest rocks ever discovered on Earth were found in western Greenland and were dated at approximately _______ billion years using isotopic dating methods.
The breakup of the most recent supercontinent of _______ is responsible for the current arrangement of continents.
During the Precambrian time, the oceans and atmosphere formed around Earth, and the concentration of oxygen gas eventually reached the point where it could support aerobic _______.
As the Earth cooled, layers formed as gravity pulled the dense material into the interior of the planet, creating a/an _______ of dense nickel and iron.

Answer 1

Answer:

a.

b.

c. Pengam

d . respiration

e. layer