Abundance of elements in Earth's crust

The abundance of elements in Earth's crust is shown in tabulated form with the estimated crustal abundance for each chemical element shown as mg/kg, or parts per million (ppm) by mass (10,000 ppm = 1%).

A reservoir is any large body to be studied as unit, like the ocean, atmosphere, mantle or crust.

[2] The composition of the Earth changed after its formation due to loss of volatile compounds, melting and recrystalization, selective loss of some elements to the deep interior, and erosion by water.

These have been depleted by being relocated deeper into the Earth's core; their abundance in meteoroids is higher.

[6] This table gives the estimated abundance in parts per million by mass of elements in the continental crust; values of the less abundant elements may vary with location by several orders of magnitude.