The protective covering of the brain
that provides passageways for cerebrospinal fluid (CSF) to drain into the
superior sagittal sinus is called the arachnoid mater.
To add, the arachnoid mater is the middle
of three layers that make up the meninges, or membranes, that surround the spinal
cord and brain.
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<span>A shelled, water-retaining egg with four membranes that enables reptiles, birds, and egg-laying mammals to complete their life cycles on dry land</span>
These processes are volcanic eruptions, impact cratering, tectonics, and erosion. Impact cratering may occur due to meteoroids. The eruptions and disruptions caused during these processes lead to the release of many minerals and other components which eventually affect the surface geology of a planet.
