Early symptoms of auditory nerve damage may involve hearing or balance problems as the auditory system communicates information concerning sound and body positioning to the brain. Symptoms include tinnitus, sensorineural hearing loss, dizziness, or vertigo with or without vomiting and nausea.owever, this is not usually the case. Most deaf people have conductive hearing loss due to damage in the middle ear structures. Neural hearing loss due to auditory nerve damage is much less common than conductive hearing loss and is usually irreversible.
The permanently frozen ground in the northern latitudes is called permafrost. The layer closest to the surface that thaws during the summer is also part of the permafrost, but is called the active layer.
The frost line âalso known as frost depth or freezing depth âis most commonly the depth to which the groundwater in soil is expected to freeze.lternatively, in Arctic and Antarctic locations the freezing depth is so deep that it becomes year-round permafrost, and the term  thaw depth  is used instead. Finally, in tropical regions, frost line may refer to the vertical geographic elevation below which frost does not occur.