At the level of the iliac tubercle, a bony prominence on the lateral aspect of the crest 5 cm posterior to the anterior superior iliac spine, the FL is preferentially thickened and this represents the origin of the ITB.
The highest layer of earths atmosphere is the exosphere. The inner core has the most or highest amount of density (iron/nickel). I think its the core of the Earth with highest temperature with  6000 degree Celsius. The crust is the layer of the Earth that has the the lowest density. It depends a bit on what you consider being a part.
The largest volume of the Earth would be by far the Mantle. In the Mantle, Olivine would be the dominant molecule down to a depth of about 650 km. Beyond than, the most abundant minerals would be (silicate perovskite), which makes up more than 90% of the remaining mantle. The core is elemental iron and nickel mostly. Thus, the most abundant mineral, and molecule, on Earth would be silicate perovskite.