Medical Dictionary. brachial plexus. noun. Medical Definition of brachial plexus. : a complex network of nerves that is formed chiefly by the lower four cervical nerves and the first thoracic nerve, lies partly within the axilla, and supplies nerves to the chest, shoulder, and arm.
Nonrenewable Sources of Energy. Most of the energy we use comes from fossil fuels, such as coal, natural gas and petroleum. Uranium is another nonrenewable source, but it is not a fossil fuel.Uranium is converted to a fuel and used in nuclear power plants.Once these natural resources are used up, they are gone forever.nergy is the power we use for transportation, for heat and light in our homes and for the manufacture of all kinds of products. There are two sources of energy: renewable and nonrenewable energy.
Natural gas and electricity were the most common types of energy used for home heating in 2007. Almost half (47%) of Canadian households used natural gas as their main heating fuel, while 37% used electricity. A further 9% used oil, 6% used wood or wood pellets and 1% used propane.ouseholds earning less than $20,000 used on average 67 GJ of energy in 2007. This figure increased to 93 GJ for those earning between $20,000 and $40,000. Households earning $150,000 or more used on average 148 GJ of energy (Table 4-6).