Moon geology could solve three mysteries of early Earth

(PhysOrg.com) -- Not much is known about the Earth before 4 billion years ago, the earliest period in the planet’s 4.5-billion-year history. Because Earth has lost almost all geological records of this era from its surface, it’s often considered the planet’s dark ages.

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<p><a href="http://www.physorg.com/news147960214.html">Moon geology could solve three mysteries of early Earth</a></p> <p>(PhysOrg.com) -- Not much is known about the Earth before 4 billion years ago, the earliest period in the planet’s 4.5-billion-year history. Because Earth has lost almost all geological records of this era from its surface, it’s often considered the planet’s dark ages.</p>