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The frontal bones form the bony eye brow ridges.
cavemen
Supraorbital notch ---> this is incorrect, for it is the frontal bones that conform the eyebrow ridges, not the supraorbital notch. The supraorbital notch, located on the eyebrow ridge, primarily serves as a groove/ passageway for superficial and/or deep sensory nerves.
That special material is called as red bone marrow. You have red bone marrow in the skull bones, vertebrae, pelvic bones, ribs, scapula and sternum. In case of children,you have the red bone marrow in the cavity of the long bones, in addition to above mentioned flat bones.
what disease or problems we encounter without the special functions of the bones
Many bones have ridges and protuberances which provide an area for muscle attachment.
are the tops of some mid-ocean ridges split by a steep-sided valley
They are hollow and light.
Periosteum
Most ridges on the fingernails are caused by normal aging and are common. Some ridges though might be an indication of an underlying health problem especially if there is a change in color.
Supraorbital notch ---> this is incorrect, for it is the frontal bones that conform the eyebrow ridges, not the supraorbital notch. The supraorbital notch, located on the eyebrow ridge, primarily serves as a groove/ passageway for superficial and/or deep sensory nerves.
Because it has special rocks and dinosaur bones in the coastline.