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 used as sources of raw materials to make goods and also to provide energy. Making goods and producing energy consumes large quantities of resources from the Earth. These resources are removed from the ground by mining. Mining includes digging ore out of the Earth which is refined to produce metals. It also includes drilling for liquids under the Earth.