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 main focus here is to understand how the Earthâs crust really is, and why it is the thinnest layer. 1  The crust ranges from 5â70 km (~3â44 miles) in depth and is the outermost layer.  The mantle extends from where the crust ends to about 2,890 km, making it the thickest layer of Earth.