Of all elements in the Earth's crust Calcium is the 5th most abundant. It makes up just over 3% of soil, air and oceans.
Statistics are to baseball what a flaky crust is to Mom's apple pie.
The Crust consists of 32% Iron, 30% Oxygen, 15% Silicon, 14% Magnesium, 3% Sulphur, 2% Nickel which totals 96%. The other 4% is made up of trace amounts of Calcium, Aluminium and other miscellaneous elements.
The crust is part of the loaf.
The Earth's crust is made up of rock.
The planet's crust is anywhere from 50km to 125km thick. It is thicker than Earth's crust which is about 40km.
The upper section of the Earth's crust is made up of around 95% igneous rock.
We belabour, I think, under a very heavy crust of consumerism really.