Earth's slowing spin may have shaped its primordial crust
Around 4.5 billion years ago, a planet-sized object collided with the newly formed Earth, throwing out the debris that would later form the moon. The collision left Earth spinning extremely fast, with days lasting just two to five hours. Yet existing models of how Earth's first crust formed and evolved have largely overlooked how the planet's later slowdown might have affected it.
We haven't written up this one. Phys.org has the full story — the link below goes straight to it.
