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Many trees produce resin, but in the majority of cases this deposit is broken down by physical and biological processes.Exposure to sunlight, rain, microorganisms (such as bacteria and fungi), and extreme temperatures tends to disintegrate resin.The primordial crust was very thin and was probably recycled by much more vigorous plate tectonics and destroyed by significant asteroid impacts, which were much more common in the early stages of the solar system.Earth has probably always had some form of basaltic crust, but the age of the oldest oceanic crust today is only about 200 million years.

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The crust occupies less than 1% of Earth's volume.[1] The oceanic crust of the sheet is different from its continental crust.A mineraloid is a mineral-like substance that does not demonstrate crystallinity.Mineraloids possess chemical compositions that vary beyond the generally accepted ranges for specific minerals.For example, obsidian is an amorphous glass and not a crystal.Jet is derived from decaying wood under extreme pressure.

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