What type of rock is shown in this photograph? 
Definitions:
Age-related Hearing
The natural decline in auditory function associated with aging, leading to conditions such as presbycusis.
Neural Impulses
Electrical signals that travel along neurons, facilitating communication within the nervous system.
Auditory Cortex
The part of the brain that is responsible for processing auditory information, located in the temporal lobe.
Presbycusis
Age-related hearing loss, first to high-frequency sounds, gradually spreading.
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