When the moon first formed, it orbited our planet much more closely, causing bizarre effects like extremely quick rotation and a weird shape
You spin me right ’roundEarth and its moon are inextricably locked together in a gravitational dance, and the laws of physics demand that if one changes its behavior, the other object must alter its own to maintain balance. One balancing act, known as the conservation of, means that Earth spins around faster when the moon is close by, and slower when the moon is farther away.
Today, the distant moon’s gravity pulls on our oceans, making tides. Back then, its gravitational potency was far greater. According to the new model, it created a colossal bulge of solid rock, one that ran around Earth as it was chased by the moon. But this pursuit caused the moon to accelerate, upsetting its tango with the planet. To restore balance, the moon began to move away from its pirouetting dance partner.
Near the poles, the crust was being torn apart. The underlying superheated mantle welled up into the gaps, decompressing and melting as it went, leading to the production of a lot of magma. This, says Lock, is “much like what happens at the, but at hyperspeed,” meaning much more quickly than the usual tortoise-like creation of new crust.
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