Ancient rocks reveal when Earth's tectonic engine 'switched on'
Scientists have identified a major turning point in Earth's geological history, when the processes shaping the planet's crust changed dramatically and began to resemble the plate tectonics we see today—about 2.5 billion years ago.
原文出处：Phys.org （本文由聚合程序自动采集，版权归原作者所有）