Material/Twenty most abundant elements in Earth's crust

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Approx figures for the 20 most abundant elements in Earth's crust:

Earth's crust
Earth cutaway
Element  % mass
Oxygen 46.71
Silicon 27.69
Aluminum 8.07
Iron 5.05
Calcium 3.65
Sodium 2.75
Potassium 2.58
Magnesium 2.08
Titanium 0.62
Hydrogen 0.14
Phosphorus 0.13
Carbon 0.09
Manganese 0.09
Sulfur 0.05
Barium 0.05
Chlorine 0.05
Chromium 0.04
Fluorine 0.03
Zirconium 0.03
Nickel 0.02


Notable missing from top 20: Copper.
Carbon might replace copper for many electrical (and thermal) conduction applications - see [1], [2] and carbon nanotube 11px-Wikipedia_logo.jpg for further information. In September 2013, a proof-of-concept computer was built from carbon nanotubes [3]


Figures from [4]
Figures rounded to two decimal places
Also need to have a list based on ease of extraction and energy required
Element links in list point to element's Wikipedia article