Conditions affecting the hearing bones: otosclerosis. Otosclerosis is the most common cause of hearing loss in young people. It's a condition of abnormal bone growth affecting the stapes, the third of the three little bones in the middle ear.
Hydroelectric dams use water to produce electricity. Natural water resources include lakes, rivers, streams, ice pack, groundwater, precipitation and oceans. As global climate change begins to affect the distribution of water resources in the United States, water use in all sectors is coming under increasing scrutiny.
Natural resources are raw supplies taken from the land from specific deposits. Each island has a finite number of resource types and a finite number of resource deposits for each type. These can be viewed easily by left-clicking on the top-middle city name display that appears when your view is over an island.