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 Resource Types. Natural resources come in two types: renewable and nonrenewable. Renewable resources such as water and trees can be replenished as they are used. This can occur at about the rate at which you use them. Nonrenewable resources run out faster than they can be replenished.