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.
Earth's two cores. There are two cores inside the Earth. The average density of the Earth is 5,515 kilograms per cubic meter. The Earth's crust density is 3,000 kilograms per cubic meter. Therefore scientists decided the core must contain iron and other heavy metals that sank to the center as the Earth was forming.