In geology, a crust is the outermost solid shell of a planet. The Earth's crust is composed of a great variety of igneous, metamorphic, and sedimentary rocks. Earth has two crust;
1. The oceanic crust
2. The Continental crust
crust
The youngest parts of the Earth's crust are found in the oceanic crust. This crust is continuously being created at the mid-oceanic ridges.
core crust
The mountain tops are the high part of the Earth's crust.
i couldn't find that but it is 0.0011 parts permillion
The outer part of the earth is the crust
crust mantle core
Tectonic Plates
crust mantle core
about 0.003 parts per billion in the earth's crust.
Helium is present in the Earth's crust, mainly sourced from the decay of radioactive elements such as uranium and thorium. The concentration of helium in the Earth's crust is estimated to be around 8 parts per million.
Earth's Crust: 200 per million by weight, 344 parts per million by moles.