the nervous system
1)
cerebrospinal fluid is the circulating tissue fluid of the cns. its locations are the
within the brain
around the brain
within the spinal cord
around the spinal cord

The cerebrospinal fluid (CSF) is found within the brain, around the brain, within the spinal cord and around the spinal cord.

Explanation:

The CSF is the watery but clear fluid that circulates through the nervous system to protect the brain, spinal cord by providing a cushioning effect.

Within the brain, CSF is present in the hollow channels of ventricles and present surrounding the brain in the subarachnoid space.

It is also present within in the central canal that runs in the spinal cord and surrounding the spinal cord in the subarachinoid space.

CSF is mainly secreted in the choroid plexus present in the ventricles (lateral, third, fourth).

The flow of the CSF begins sequentially through the four ventricles and then the foramina in the brain, and then into the subarachnoid spaces around the brain and the spinal cord.

the plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. the magma then emerges as lava from the boundary and cools, creating a new crust.