Material/Twenty most abundant elements in Earth's crust

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Approximate figures for the twenty most abundant elements in the earth's crust:

Canyon
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

Figures from http://www.science.co.il/PTelements.asp?s=Earth
Figures rounded to two decimal places
Also need to have a list based on ease of extraction and energy required