The counter interval is 40.
I don’t get the rest?!
Cool air produces high air pressure and warm air produces low air pressure. it will affect pressure and cause wind when warm air rises and cool air moving in which will replace the warm air
Spinal meninges.
The spinal meninges are the dura mater, separated from the vertebral column by a space called epidural space, and separated from the next meninge in profundity by the subdural space; the arachnoid mater with the subarachnoid space; and, the most profound, the pia mater.