Earth's crustal evolution | Wikipedia audio article

This is an audio version of the Wikipedia Article:


00:01:07 1 Early crust
00:01:17 1.1 Mechanisms of early crust formation
00:03:22 2 Crustal dichotomy
00:03:43 2.1 Timing
00:04:38 2.2 Formation
00:04:46 2.2.1 Impact cratering
00:05:56 2.2.1.1 Effects
00:07:15 3 Types of crust
00:07:25 3.1 Primordial crust
00:09:12 3.2 Secondary crust
00:09:58 3.3 Tertiary crust
00:10:51 4 Initiation of plate tectonics
00:11:01 4.1 Plume induced subduction
00:13:16 4.2 Late Heavy Bombardment
00:13:52 5 Crustal growth rates
00:14:03 5.1 Lithological dating
00:15:50 5.2 Zircon dating



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SUMMARY
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Earth's crustal evolution involves the formation, destruction and renewal of the rocky outer shell at that planet's surface.
The variation in composition within the Earth's crust is much greater than that of other terrestrial planets. Mars, Venus, Mercury and other planetary bodies have relatively quasi-uniform crusts unlike that of the Earth which contains both oceanic and continental plates. This unique property reflects the complex series of crustal processes that have taken place throughout the planet's history, including the ongoing process of plate tectonics.
The proposed mechanisms regarding Earth's crustal evolution take a theory-orientated approach. Fragmentary geologic evidence and observations provide the basis for hypothetical solutions to problems relating to the early Earth system. Therefore, a combination of these theories creates both a framework of current understanding and also a platform for future study.