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单词 Crustal abundance
释义

Crustal abundance

英语百科

Abundance of elements in Earth's crust

Abundance (atom fraction) of the chemical elements in Earth's upper continental crust as a function of atomic number. The rarest elements in the crust (shown in yellow) are not the heaviest, but are rather the siderophile (iron-loving) elements in the Goldschmidt classification of elements. These have been depleted by being relocated deeper into the Earth's core. Their abundance in meteoroids is higher. Additionally, tellurium and selenium have been depleted from the crust due to formation of volatile hydrides.

The table shows the abundance of elements in Earth's crust. Numbers show percentage or parts per million (ppm) in mass; 10,000 ppm = 1%.

Note that numbers are estimates, and they will vary depending on source and method of estimation. Order of magnitude of data can roughly be relied upon.

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