A scientist recently proposed a new idea: the Earth Plate movement began no later than 3 5 billion years ago  He reasoned that plate tectonics must transform the natural dark mafic rocks into light-colored felsic rocks  And by 3
The light-colored felsic rocks are essentially regenerated from the dark-colored mafic rocks and billions of years ago, the mafic rocks had an absolute quantitative advantage on the earth.
5 billion years ago, the earth already had light-colored felsic rocks